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CVE-2026-42006

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE...

4.3 MediumFix available

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.62%Up 0.6 points since May 13, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.3

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
CVE-2026-42006
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400, CWE-770
Updated
2026-11-02
EUVDEUVD-2026-29473 7.5

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
EUVD-2026-29473
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-h665-fh45-xq6r 4.3

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE...

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
GHSA-h665-fh45-xq6r
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400, CWE-770
Updated
2026-11-02
NVD 4.3

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
CVE-2026-42006
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400, CWE-770
Updated
2026-11-02
OSVALPINE-CVE-2026-42006 4.3

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
ALPINE-CVE-2026-42006
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSV 4.3

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
CVE-2026-42006
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400
Updated
2026-11-02
Show 36 moreShow less
OSVDEBIAN-CVE-2026-42006 4.3

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
DEBIAN-CVE-2026-42006
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVOESA-2026-2722 6.5

dovecot security update

Dovecot is an IMAP server for Linux/UNIX-like systems, written with security primarily in mind. It also contains a small POP3 server. It supports mail in either of maildir or mbox formats.

Security Fix(es):

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known.(CVE-2026-33603)

Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.(CVE-2026-40016)

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.(CVE-2026-40020)

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.(CVE-2026-42006)

Record
OESA-2026-2722
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:41905 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:41905
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:41988 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:41988
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:42091 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:42091
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:44355 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:44355
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:44357 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:44357
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:44373 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:44373
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:46379 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:46379
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:46380 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:46380
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:46381 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:46381
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:46532 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:46532
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:49513 7.5

Red Hat Security Advisory: dovecot security update

Record
RHSA-2026:49513
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:41905 7.5

Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es):

  • dovecot: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:41905
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:41988 7.5

Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es):

  • dovecot: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:41988
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:46532 7.5

Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es):

  • dovecot: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:46532
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-42006 4.3

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
UBUNTU-CVE-2026-42006
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVALSA-2026:41905 No score

Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es):

  • dovecot: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:41905
Updated
2026-11-02
OSVALSA-2026:41988 No score

Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es):

  • dovecot: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:41988
Updated
2026-11-02
OSVALSA-2026:46532 No score

Important: dovecot security update

Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.

Security Fix(es):

  • dovecot: Dovecot: Denial of Service via excessive IMAP bracing (CVE-2026-42006)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:46532
Updated
2026-11-02
OSVAZL-86811 No score

CVE-2026-42006 affecting package dovecot 2.3.20-1

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Record
AZL-86811
Updated
2026-11-05
OSVCLSA-2026-1779360036 No score

dovecot: Fix of CVE-2026-42006

  • CVE-2026-42006: fix imap-login list_count_limit to actually limit open '(' characters; the previous fix limited closing ')' instead, leaving the bracing memory exhaustion vector open
Record
CLSA-2026-1779360036
Updated
2026-11-02
OSVCLSA-2026-1779360288 No score

dovecot: Fix of CVE-2026-42006

  • CVE-2026-42006: fix imap-login list_count_limit to actually limit open '(' characters; the previous fix limited closing ')' instead, leaving the bracing memory exhaustion vector open
Record
CLSA-2026-1779360288
Updated
2026-11-02
OSVCLSA-2026-1779360319 No score

dovecot: Fix of CVE-2026-42006

  • CVE-2026-42006: fix imap-login list_count_limit to actually limit open '(' characters; the previous fix limited closing ')' instead, leaving the bracing memory exhaustion vector open
Record
CLSA-2026-1779360319
Updated
2026-11-02
OSVCLSA-2026-1779371000 No score

dovecot: Fix of 2 CVEs

  • CVE-2026-42006: lib-imap: fix list_count_limit to actually count open '(' instead of close ')', preventing an imap-login memory-exhaustion DoS that bypassed the CVE-2026-27857 fix
Record
CLSA-2026-1779371000
Updated
2026-11-02
OSVCLSA-2026-1779378574 No score

dovecot: Fix of 2 CVEs

  • CVE-2026-42006: lib-imap: fix list_count_limit to actually count open '(' instead of close ')', preventing an imap-login memory-exhaustion DoS that bypassed the CVE-2026-27857 fix
Record
CLSA-2026-1779378574
Updated
2026-11-02
OSVCLSA-2026-1780910915 No score

dovecot: Fix of 3 CVEs

  • CVE-2026-40020: imap-acl: reject CR/LF/control-char and non-UTF-8 injection in SETACL identifier
  • CVE-2026-42006: lib-imap: fix list_count_limit to actually bound '(' (incomplete fix for CVE-2026-27857)
  • CVE-2026-40016: lib-sieve: enforce sieve_max_cpu_time inside :contains/:matches matcher loops
Record
CLSA-2026-1780910915
Updated
2026-11-02
OSVCLSA-2026-1781096989 No score

dovecot: Fix of 4 CVEs

  • CVE-2026-40020: imap-acl: reject CR/LF injection in SETACL identifier
  • CVE-2026-42006: lib-imap: fix list_count_limit to actually limit '(' (incomplete fix for CVE-2026-27857)
  • CVE-2026-33603: login-common: reject non-base64 SASL responses to prevent SCRAM channel binding bypass
  • CVE-2026-40016: lib-sieve: enforce sieve_max_cpu_time inside :contains/:matches matcher loops
Record
CLSA-2026-1781096989
Updated
2026-11-02
OSVCLSA-2026-1782386807 No score

Fix CVE(s): CVE-2026-42006

  • SECURITY UPDATE: imap-login excessive memory usage DoS via too many '(' in IMAP list (ELSCVE-127370)
    • debian/patches/CVE-2026-42006.patch: move list_count_limit check and counter increment into imap_parser_open_list() so '(' is what is actually bounded (the previous CVE-2026-27857 fix only limited ')'). Backport of upstream commit da1438c76b797f.
    • CVE-2026-42006
Record
CLSA-2026-1782386807
Updated
2026-11-02
OSVCLSA-2026-1790599296 No score

dovecot: Fix of CVE-2026-27856

  • rebase to 2.2.36-8.0.3.el7
  • the vendor fixes in this build: CVE-2025-59032, CVE-2026-27856, CVE-2026-42006
  • drop the 2 TuxCare CVE backports; the vendor now ships their own patches for them
  • no TuxCare CVE patches remain
Record
CLSA-2026-1790599296
Updated
2026-11-02
OSVCLSA-2026-1790599329 No score

dovecot: Fix of 3 CVEs

  • rebase to 2.2.36-8.0.3.el7
  • the vendor fixes in this build: CVE-2025-59032, CVE-2026-27856, CVE-2026-42006
  • drop the 2 TuxCare CVE backports; the vendor now ships their own patches for them
  • no TuxCare CVE patches remain
Record
CLSA-2026-1790599329
Updated
2026-11-02
OSVopenSUSE-SU-2026:10766-1 No score

dovecot24-2.4.4-1.1 on GA media

These are all security issues fixed in the dovecot24-2.4.4-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10766-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21109-1 No score

Security update for dovecot24

This update for dovecot24 fixes the following issues

  • CVE-2026-27851: lib-var-expand: safe filter leaks to all following pipelines (bsc#1265146).
  • CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).
  • CVE-2026-40016: Sieve: contains/: matches O(NxM) substring match bypasses sieve_max_cpu_time limit (bsc#1265148).
  • CVE-2026-40020: IMAP folders can be shared-spammed to everyone (bsc#1265149).
  • CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing over IMAP (bsc#1265150).

Changes for dovecot24:

  • Update to 2.4.4
Record
openSUSE-SU-2026:21109-1
Updated
2026-11-02
OSVSUSE-SU-2026:22185-1 No score

Security update for dovecot24

This update for dovecot24 fixes the following issues

  • CVE-2026-27851: lib-var-expand: safe filter leaks to all following pipelines (bsc#1265146).
  • CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).
  • CVE-2026-40016: Sieve: contains/: matches O(NxM) substring match bypasses sieve_max_cpu_time limit (bsc#1265148).
  • CVE-2026-40020: IMAP folders can be shared-spammed to everyone (bsc#1265149).
  • CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing over IMAP (bsc#1265150).

Changes for dovecot24:

  • Update to 2.4.4
Record
SUSE-SU-2026:22185-1
Updated
2026-11-02
OSVSUSE-SU-2026:2645-1 No score

Security update for dovecot22

This update for dovecot22 fixes the following issues

  • CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).
  • CVE-2026-40020: IMAP folders can be shared-spammed to everyone (bsc#1265149).
  • CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing over IMAP (bsc#1265150).
Record
SUSE-SU-2026:2645-1
Updated
2026-11-02
OSVSUSE-SU-2026:4139-1 No score

Security update for dovecot23

This update for dovecot23 fixes the following issues:

  • CVE-2024-23184: parsing of messages containing many address headers (From, To, Cc, Bcc, etc.) could be excessively CPU intensive (bsc#1229184).
  • CVE-2024-23185: large headers can cause resource exhaustion when parsing message (bsc#1229183).
  • CVE-2025-59028: Invalid base64 authentication can cause DoS for other logins (bsc#1260894).
  • CVE-2025-59031: decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing (bsc#1260895).
  • CVE-2025-59032: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).
  • CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799).
  • CVE-2026-27855: OTP driver vulnerable to replay attack (bsc#1260900).
  • CVE-2026-27856: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).
  • CVE-2026-27857: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).
  • CVE-2026-27858: pigeonhole: managesieve-login can allocate large amount of memory during authentication (bsc#1260901).
  • CVE-2026-27859: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).
  • CVE-2026-33263: submission-login: Panic when mail_max_userip_connections is reached (bsc#1276794).
  • CVE-2026-33603: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).
  • CVE-2026-33604: SMTP Smuggling via Missing Dot-Stuffing (bsc#1276802).
  • CVE-2026-33605: managesieve-login: Pre-auth crash (bsc#1276809).
  • CVE-2026-33606: dsync: Mail content can cause dsync protocol injection (bsc#1276800).
  • CVE-2026-33607: IMAP LIST match_sub() Exponential Backtracking -- CPU Denial of Service (bsc#1276795).
  • CVE-2026-40014: CPU DoS via Crafted References Header (bsc#1276804).
  • CVE-2026-40015: imap-hibernate can be crashed (bsc#1276812).
  • CVE-2026-40016: Sieve :contains/:matches O(NxM) substring match bypasses sieve_max_cpu_time limit (bsc#1265148).
  • CVE-2026-40019: managesieve-login pre-auth infinite loop (bsc#1276811).
  • CVE-2026-40020: IMAP folders can be shared-spammed to everyone (bsc#1265149).
  • CVE-2026-40203: IMAP Compression Can Reveal Whether a Small Synced Email Body Matches Sender-Chosen Text (bsc#1276815).
  • CVE-2026-40205: OAuth2 passdb scope enforcement bypass via OR semantics in remote validation path (bsc#1276820).
  • CVE-2026-42006: imap-login: uncontrolled memory usage with excessive bracing over IMAP (bsc#1265150).
  • CVE-2026-42007: editheader RCE (bsc#1276817).
  • CVE-2026-42008: XCLIENT FORWARD= bare token not namespaced (bsc#1276824).
  • CVE-2026-42391: imap: Pre-login memory/CPU growth with ID command (bsc#1276835).
  • CVE-2026-42393: doveadm_password or api key length can still be leaked with timing comparisons (bsc#1276827).
  • CVE-2026-42395: Single NUL-Byte XCLIENT FORWARD Payload Crashes (bsc#1276826).
  • CVE-2026-52681: Sieve resource usage tracking lost when active script changes (bsc#1276828).
  • CVE-2026-52687: IMAP: COMPRESS ZSTD can cause excessive memory usage (bsc#1276837).
  • CVE-2026-73208: auth: db-oauth2: aud claim used as fallback for missing scope claim (bsc#1276830).
  • CVE-2026-73209: imap-login crash: Self-recursion on zero-output decompress chunks (bsc#1276833).

Changes for dovecot23:

  • Update to version 2.3.21.1.
Record
SUSE-SU-2026:4139-1
Updated
2026-11-02

Affected products

Show 6 moreShow less

Affected packages

Affected packages
PackageAffectedFixed
dovecot
Alpine:v3.23
 before 2.4.4-r0
2.4.4-r0
dovecot
Alpine:v3.24
 before 2.4.4-r0
2.4.4-r0
dovecot
AlmaLinux:9
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-devel
AlmaLinux:9
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-mysql
AlmaLinux:9
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pgsql
AlmaLinux:9
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pigeonhole
AlmaLinux:9
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot
AlmaLinux:10
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-devel
AlmaLinux:10
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-mysql
AlmaLinux:10
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
Show 159 moreShow less
Affected packages
PackageAffectedFixed
dovecot-pgsql
AlmaLinux:10
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-pigeonhole
AlmaLinux:10
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot
AlmaLinux:8
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-devel
AlmaLinux:8
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-mysql
AlmaLinux:8
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pgsql
AlmaLinux:8
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pigeonhole
AlmaLinux:8
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot
Azure Linux:3
 through 2.3.20-1 None known
dovecot
TuxCare:CentOS:8.5
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-devel
TuxCare:CentOS:8.5
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-mysql
TuxCare:CentOS:8.5
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-pgsql
TuxCare:CentOS:8.5
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-pigeonhole
TuxCare:CentOS:8.5
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot
TuxCare:CentOS-Stream:8
 before 1:2.3.16-5.el8.tuxcare.els3
1:2.3.16-5.el8.tuxcare.els3
dovecot-devel
TuxCare:CentOS-Stream:8
 before 1:2.3.16-5.el8.tuxcare.els3
1:2.3.16-5.el8.tuxcare.els3
dovecot-mysql
TuxCare:CentOS-Stream:8
 before 1:2.3.16-5.el8.tuxcare.els3
1:2.3.16-5.el8.tuxcare.els3
dovecot-pgsql
TuxCare:CentOS-Stream:8
 before 1:2.3.16-5.el8.tuxcare.els3
1:2.3.16-5.el8.tuxcare.els3
dovecot-pigeonhole
TuxCare:CentOS-Stream:8
 before 1:2.3.16-5.el8.tuxcare.els3
1:2.3.16-5.el8.tuxcare.els3
dovecot
TuxCare:CentOS:8.4
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-devel
TuxCare:CentOS:8.4
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-mysql
TuxCare:CentOS:8.4
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-pgsql
TuxCare:CentOS:8.4
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot-pigeonhole
TuxCare:CentOS:8.4
 before 1:2.3.8-9.el8.tuxcare.els5
1:2.3.8-9.el8.tuxcare.els5
dovecot
TuxCare:CentOS:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-devel
TuxCare:CentOS:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-mysql
TuxCare:CentOS:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-pgsql
TuxCare:CentOS:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-pigeonhole
TuxCare:CentOS:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot
TuxCare:OracleLinux:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-devel
TuxCare:OracleLinux:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-mysql
TuxCare:OracleLinux:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-pgsql
TuxCare:OracleLinux:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot-pigeonhole
TuxCare:OracleLinux:6
From an advisory covering 2 CVEs
 before 1:2.0.9-23.el6.tuxcare.els5
1:2.0.9-23.el6.tuxcare.els5
dovecot
TuxCare:AlmaLinux:9.2
From an advisory covering 4 CVEs
 before 1:2.3.16-8.el9_2.tuxcare.els6
1:2.3.16-8.el9_2.tuxcare.els6
dovecot-devel
TuxCare:AlmaLinux:9.2
From an advisory covering 4 CVEs
 before 1:2.3.16-8.el9_2.tuxcare.els6
1:2.3.16-8.el9_2.tuxcare.els6
dovecot-mysql
TuxCare:AlmaLinux:9.2
From an advisory covering 4 CVEs
 before 1:2.3.16-8.el9_2.tuxcare.els6
1:2.3.16-8.el9_2.tuxcare.els6
dovecot-pgsql
TuxCare:AlmaLinux:9.2
From an advisory covering 4 CVEs
 before 1:2.3.16-8.el9_2.tuxcare.els6
1:2.3.16-8.el9_2.tuxcare.els6
dovecot-pigeonhole
TuxCare:AlmaLinux:9.2
From an advisory covering 4 CVEs
 before 1:2.3.16-8.el9_2.tuxcare.els6
1:2.3.16-8.el9_2.tuxcare.els6
dovecot
TuxCare:AlmaLinux:9.6
From an advisory covering 5 CVEs
 before 1:2.3.16-15.el9.tuxcare.els3
1:2.3.16-15.el9.tuxcare.els3
dovecot-devel
TuxCare:AlmaLinux:9.6
From an advisory covering 5 CVEs
 before 1:2.3.16-15.el9.tuxcare.els3
1:2.3.16-15.el9.tuxcare.els3
dovecot-mysql
TuxCare:AlmaLinux:9.6
From an advisory covering 5 CVEs
 before 1:2.3.16-15.el9.tuxcare.els3
1:2.3.16-15.el9.tuxcare.els3
dovecot-pgsql
TuxCare:AlmaLinux:9.6
From an advisory covering 5 CVEs
 before 1:2.3.16-15.el9.tuxcare.els3
1:2.3.16-15.el9.tuxcare.els3
dovecot-pigeonhole
TuxCare:AlmaLinux:9.6
From an advisory covering 5 CVEs
 before 1:2.3.16-15.el9.tuxcare.els3
1:2.3.16-15.el9.tuxcare.els3
dovecot-auth-lua
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-core
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-dev
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-gssapi
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-imapd
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-ldap
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-lmtpd
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-lucene
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-managesieved
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-mysql
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-pgsql
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-pop3d
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-sieve
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-solr
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-sqlite
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot-submissiond
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
mail-stack-delivery
TuxCare:Ubuntu:20.04
From an advisory covering 2 CVEs
 before 1:2.3.7.2-1ubuntu3.7+tuxcare.els2
1:2.3.7.2-1ubuntu3.7+tuxcare.els2
dovecot
TuxCare:OracleLinux:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-devel
TuxCare:OracleLinux:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-mysql
TuxCare:OracleLinux:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-pgsql
TuxCare:OracleLinux:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-pigeonhole
TuxCare:OracleLinux:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot
TuxCare:RHEL:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-devel
TuxCare:RHEL:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-mysql
TuxCare:RHEL:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-pgsql
TuxCare:RHEL:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot-pigeonhole
TuxCare:RHEL:7
From an advisory covering 3 CVEs
 before 1:2.2.36-8.0.3.el7.tuxcare.els1
1:2.2.36-8.0.3.el7.tuxcare.els1
dovecot
Debian:12
 before 1:2.3.19.1+dfsg1-2.1+deb12u6, plus listed versions
1:2.3.19.1+dfsg1-2.11:2.3.19.1+dfsg1-2.1+deb12u11:2.3.19.1+dfsg1-2.1+deb12u21:2.3.19.1+dfsg1-2.1+deb12u31:2.3.19.1+dfsg1-2.1+deb12u41:2.3.19.1+dfsg1-2.1+deb12u5
1:2.3.19.1+dfsg1-2.1+deb12u6
dovecot
Debian:13
 before 1:2.4.1+dfsg1-6+deb13u6, plus listed versions
1:2.4.1+dfsg1-61:2.4.1+dfsg1-6+deb13u11:2.4.1+dfsg1-6+deb13u21:2.4.1+dfsg1-6+deb13u31:2.4.1+dfsg1-6+deb13u41:2.4.1+dfsg1-6+deb13u5
1:2.4.1+dfsg1-6+deb13u6
dovecot
Debian:14
 before 1:2.4.4+dfsg1-1, plus listed versions
1:2.4.1+dfsg1-61:2.4.1+dfsg1-71:2.4.1+dfsg1-81:2.4.1+dfsg1-91:2.4.2+dfsg1-1
Show 5 moreShow less
1:2.4.2+dfsg1-21:2.4.2+dfsg1-31:2.4.2+dfsg1-41:2.4.3+dfsg1-11:2.4.3+dfsg1-2
1:2.4.4+dfsg1-1
dovecot
openEuler:24.03-LTS-SP3
From an advisory covering 4 CVEs
 before 2.3.20-5.oe2403sp3
2.3.20-5.oe2403sp3
dovecot
openEuler:20.03-LTS-SP4
From an advisory covering 4 CVEs
 before 2.3.15-8.oe2003sp4
2.3.15-8.oe2003sp4
dovecot
openEuler:22.03-LTS-SP4
From an advisory covering 4 CVEs
 before 2.3.15-8.oe2203sp4
2.3.15-8.oe2203sp4
dovecot
openEuler:24.03-LTS-SP1
From an advisory covering 4 CVEs
 before 2.3.20-5.oe2403sp1
2.3.20-5.oe2403sp1
dovecot
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-debuginfo
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-debugsource
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-mysql
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-mysql-debuginfo
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pgsql
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pgsql-debuginfo
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pigeonhole
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pigeonhole-debuginfo
Red Hat:enterprise_linux:9::appstream
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot
Red Hat:enterprise_linux:9::crb
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-debuginfo
Red Hat:enterprise_linux:9::crb
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-debugsource
Red Hat:enterprise_linux:9::crb
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-devel
Red Hat:enterprise_linux:9::crb
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-mysql-debuginfo
Red Hat:enterprise_linux:9::crb
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pgsql-debuginfo
Red Hat:enterprise_linux:9::crb
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot-pigeonhole-debuginfo
Red Hat:enterprise_linux:9::crb
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-debuginfo
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-debugsource
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-mysql
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-mysql-debuginfo
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-pgsql
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-pgsql-debuginfo
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-pigeonhole
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-pigeonhole-debuginfo
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot-devel
Red Hat:enterprise_linux:10.2
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot
Red Hat:enterprise_linux_eus:10.0
 before 1:2.3.21-16.el10_0.2
1:2.3.21-16.el10_0.2
dovecot
Red Hat:rhel_eus:9.6::appstream
 before 1:2.3.16-15.el9_6.2
1:2.3.16-15.el9_6.2
dovecot
Red Hat:rhel_eus:9.6::crb
 before 1:2.3.16-15.el9_6.2
1:2.3.16-15.el9_6.2
dovecot
Red Hat:rhel_e4s:9.4::appstream
 before 1:2.3.16-11.el9_4.3
1:2.3.16-11.el9_4.3
dovecot
Red Hat:rhel_e4s:9.2::appstream
 before 1:2.3.16-8.el9_2.3
1:2.3.16-8.el9_2.3
dovecot
Red Hat:rhel_aus:8.6::appstream
 before 1:2.3.16-2.el8_6.2
1:2.3.16-2.el8_6.2
dovecot
Red Hat:rhel_eus_long_life:8.6::appstream
 before 1:2.3.16-2.el8_6.2
1:2.3.16-2.el8_6.2
dovecot
Red Hat:rhel_aus:8.4::appstream
 before 1:2.3.8-9.el8_4.2
1:2.3.8-9.el8_4.2
dovecot
Red Hat:rhel_eus_long_life:8.4::appstream
 before 1:2.3.8-9.el8_4.2
1:2.3.8-9.el8_4.2
dovecot
Red Hat:rhel_e4s:8.8::appstream
 before 1:2.3.16-3.el8_8.2
1:2.3.16-3.el8_8.2
dovecot
Red Hat:rhel_tus:8.8::appstream
 before 1:2.3.16-3.el8_8.2
1:2.3.16-3.el8_8.2
dovecot
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-debugsource
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-mysql
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-mysql-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pgsql
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pgsql-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pigeonhole
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pigeonhole-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot
Red Hat:enterprise_linux:8::crb
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-debuginfo
Red Hat:enterprise_linux:8::crb
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-debugsource
Red Hat:enterprise_linux:8::crb
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-devel
Red Hat:enterprise_linux:8::crb
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-mysql-debuginfo
Red Hat:enterprise_linux:8::crb
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pgsql-debuginfo
Red Hat:enterprise_linux:8::crb
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot-pigeonhole-debuginfo
Red Hat:enterprise_linux:8::crb
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot
Red Hat:rhel_els:7
 before 1:2.2.36-8.el7_9.2
1:2.2.36-8.el7_9.2
dovecot
Rocky Linux:9
 before 1:2.3.16-18.el9_8.1
1:2.3.16-18.el9_8.1
dovecot
Rocky Linux:10
 before 1:2.3.21-19.el10_2.1
1:2.3.21-19.el10_2.1
dovecot
Rocky Linux:8
 before 1:2.3.16-8.el8_10
1:2.3.16-8.el8_10
dovecot24
SUSE:Linux Enterprise Server 16.0
From an advisory covering 5 CVEs
 before 2.4.4-160000.1.1
2.4.4-160000.1.1
dovecot24
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 5 CVEs
 before 2.4.4-160000.1.1
2.4.4-160000.1.1
dovecot22
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 3 CVEs
 before 2.2.31-19.37.2
2.2.31-19.37.2
dovecot22
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 3 CVEs
 before 2.2.31-19.37.2
2.2.31-19.37.2
dovecot23
SUSE:Linux Enterprise Module for Server Applications 15 SP7
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise Server 15 SP4-LTSS
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise Server 15 SP5-LTSS
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise Server 15 SP6-LTSS
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot23
SUSE:Linux Enterprise Server for SAP Applications 15 SP6
From an advisory covering 34 CVEs
 before 2.3.21.1-150200.76.1
2.3.21.1-150200.76.1
dovecot
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1:2.1.7-7ubuntu31:2.2.9-1ubuntu11:2.2.9-1ubuntu21:2.2.9-1ubuntu2.11:2.2.9-1ubuntu2.3
Show 7 moreShow less
1:2.2.9-1ubuntu2.41:2.2.9-1ubuntu2.51:2.2.9-1ubuntu2.61:2.2.9-1ubuntu2.6+esm11:2.2.9-1ubuntu2.6+esm21:2.2.9-1ubuntu2.6+esm31:2.2.9-1ubuntu2.6+esm4
 None known
dovecot
Ubuntu:16.04:LTS
 All versions, plus listed versions
1:2.2.18-2ubuntu21:2.2.22-1ubuntu11:2.2.22-1ubuntu21:2.2.22-1ubuntu2.11:2.2.22-1ubuntu2.2
Show 11 moreShow less
1:2.2.22-1ubuntu2.31:2.2.22-1ubuntu2.41:2.2.22-1ubuntu2.61:2.2.22-1ubuntu2.71:2.2.22-1ubuntu2.81:2.2.22-1ubuntu2.91:2.2.22-1ubuntu2.101:2.2.22-1ubuntu2.111:2.2.22-1ubuntu2.121:2.2.22-1ubuntu2.131:2.2.22-1ubuntu2.14
 None known
dovecot
Ubuntu:18.04:LTS
 All versions, plus listed versions
1:2.2.27-3ubuntu11:2.2.33.2-1ubuntu11:2.2.33.2-1ubuntu21:2.2.33.2-1ubuntu31:2.2.33.2-1ubuntu4
Show 8 moreShow less
1:2.2.33.2-1ubuntu4.11:2.2.33.2-1ubuntu4.21:2.2.33.2-1ubuntu4.31:2.2.33.2-1ubuntu4.41:2.2.33.2-1ubuntu4.51:2.2.33.2-1ubuntu4.61:2.2.33.2-1ubuntu4.71:2.2.33.2-1ubuntu4.8
 None known
dovecot
Ubuntu:20.04:LTS
 All versions, plus listed versions
1:2.3.4.1-5ubuntu31:2.3.7.2-1ubuntu11:2.3.7.2-1ubuntu21:2.3.7.2-1ubuntu31:2.3.7.2-1ubuntu3.1
Show 6 moreShow less
1:2.3.7.2-1ubuntu3.21:2.3.7.2-1ubuntu3.31:2.3.7.2-1ubuntu3.41:2.3.7.2-1ubuntu3.51:2.3.7.2-1ubuntu3.61:2.3.7.2-1ubuntu3.7
 None known
dovecot
Ubuntu:22.04:LTS
 before 1:2.3.16+dfsg1-3ubuntu2.9, plus listed versions
1:2.3.13+dfsg1-1ubuntu31:2.3.16+dfsg1-3ubuntu11:2.3.16+dfsg1-3ubuntu21:2.3.16+dfsg1-3ubuntu2.11:2.3.16+dfsg1-3ubuntu2.2
Show 4 moreShow less
1:2.3.16+dfsg1-3ubuntu2.41:2.3.16+dfsg1-3ubuntu2.61:2.3.16+dfsg1-3ubuntu2.71:2.3.16+dfsg1-3ubuntu2.8
1:2.3.16+dfsg1-3ubuntu2.9
dovecot
Ubuntu:24.04:LTS
 before 1:2.3.21+dfsg1-2ubuntu6.5, plus listed versions
1:2.3.20+dfsg1-1ubuntu31:2.3.21+dfsg1-2ubuntu11:2.3.21+dfsg1-2ubuntu21:2.3.21+dfsg1-2ubuntu41:2.3.21+dfsg1-2ubuntu5
Show 5 moreShow less
1:2.3.21+dfsg1-2ubuntu61:2.3.21+dfsg1-2ubuntu6.11:2.3.21+dfsg1-2ubuntu6.21:2.3.21+dfsg1-2ubuntu6.31:2.3.21+dfsg1-2ubuntu6.4
1:2.3.21+dfsg1-2ubuntu6.5
dovecot
Ubuntu:25.10
 before 1:2.4.1+dfsg1-5ubuntu4.2, plus listed versions
1:2.3.21.1+dfsg1-1ubuntu21:2.4.1+dfsg1-5ubuntu11:2.4.1+dfsg1-5ubuntu31:2.4.1+dfsg1-5ubuntu41:2.4.1+dfsg1-5ubuntu4.1
1:2.4.1+dfsg1-5ubuntu4.2
dovecot
Ubuntu:26.04:LTS
 before 1:2.4.2+dfsg1-3ubuntu2.1, plus listed versions
1:2.4.1+dfsg1-5ubuntu41:2.4.1+dfsg1-5ubuntu51:2.4.2+dfsg1-3ubuntu11:2.4.2+dfsg1-3ubuntu2
1:2.4.2+dfsg1-3ubuntu2.1
dovecot24
openSUSE:Tumbleweed
From an advisory covering 5 CVEs
 before 2.4.4-1.1
2.4.4-1.1
dovecot24
openSUSE:Leap 16.0
From an advisory covering 5 CVEs
 before 2.4.4-160000.1.1
2.4.4-160000.1.1

History

History
RecordedChangedSources
affected
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42006 is a medium vulnerability (CVSS 4.3) in Dovecot, published May 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 50th percentile. Fixed in dovecot 2.4.4-r0.

References

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