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CVE-2026-4892

CVE-2026-4892

8.4 HighFix available

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.81%Up 0.8 points since May 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.4

CVE-2026-4892

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
CVE-2026-4892
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
EUVDEUVD-2026-29154 8.8

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
EUVD-2026-29154
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-m62j-63mf-xr95 8.4

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows...

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
GHSA-m62j-63mf-xr95
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
NVD 8.4

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
CVE-2026-4892
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
OSVALPINE-CVE-2026-4892 8.4

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
ALPINE-CVE-2026-4892
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBELL-CVE-2026-4892 8.4
Record
BELL-CVE-2026-4892
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 33 moreShow less
OSV 8.4

CVE-2026-4892

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
CVE-2026-4892
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2026-4892 8.4

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
DEBIAN-CVE-2026-4892
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-2435 9.8

dnsmasq security update

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portable hotspots, and to support virtual networking in virtualisation frameworks.

Security Fix(es):

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.(CVE-2026-2291)

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4890)

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4891)

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.(CVE-2026-4892)

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.(CVE-2026-4893)

A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.(CVE-2026-5172)

Record
OESA-2026-2435
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-2436 9.8

dnsmasq security update

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portable hotspots, and to support virtual networking in virtualisation frameworks.

Security Fix(es):

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.(CVE-2026-2291)

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4890)

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4891)

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.(CVE-2026-4892)

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.(CVE-2026-4893)

A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.(CVE-2026-5172)

Record
OESA-2026-2436
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-2437 9.8

dnsmasq security update

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portable hotspots, and to support virtual networking in virtualisation frameworks.

Security Fix(es):

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.(CVE-2026-2291)

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4890)

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4891)

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.(CVE-2026-4892)

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.(CVE-2026-4893)

Record
OESA-2026-2437
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-2438 9.8

dnsmasq security update

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portable hotspots, and to support virtual networking in virtualisation frameworks.

Security Fix(es):

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.(CVE-2026-2291)

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4890)

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4891)

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.(CVE-2026-4892)

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.(CVE-2026-4893)

Record
OESA-2026-2438
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2026-2509 9.8

dnsmasq security update

Dnsmasq provides network infrastructure for small networks: DNS, DHCP, router advertisement and network boot. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. It has also been widely used for tethering on smartphones and portable hotspots, and to support virtual networking in virtualisation frameworks.

Security Fix(es):

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.(CVE-2026-2291)

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4890)

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.(CVE-2026-4891)

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.(CVE-2026-4892)

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.(CVE-2026-4893)

A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.(CVE-2026-5172)

Record
OESA-2026-2509
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2026:19158 8.8

Red Hat Security Advisory: dnsmasq security update

Record
RHSA-2026:19158
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2026:19373 8.8

Red Hat Security Advisory: dnsmasq security update

Record
RHSA-2026:19373
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2026:20589 8.8

Red Hat Security Advisory: dnsmasq security update

Record
RHSA-2026:20589
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2026:34508 8.8

Red Hat Security Advisory: dnsmasq security update

Record
RHSA-2026:34508
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRLSA-2026:19158 8.8

Important: dnsmasq security update

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

  • dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)

  • dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)

  • dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)

  • dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)

  • dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

  • dnsmasq: extract_addresses() OOB read via malformed rdlen (CVE-2026-5172)

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-2026:19158
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRLSA-2026:19373 8.8

Important: dnsmasq security update

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

  • dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)

  • dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)

  • dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)

  • dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)

  • dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

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-2026:19373
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRLSA-2026:20589 8.8

Important: dnsmasq security update

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

  • dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)

  • dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)

  • dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)

  • dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)

  • dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

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-2026:20589
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-4892 8.4

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Record
UBUNTU-CVE-2026-4892
CVSS 3.1
8.4 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVALSA-2026:19158 No score

Important: dnsmasq security update

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

  • dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)
  • dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)
  • dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)
  • dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)
  • dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)
  • dnsmasq: extract_addresses() OOB read via malformed rdlen (CVE-2026-5172)

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-2026:19158
Updated
2026-11-02
OSVALSA-2026:19373 No score

Important: dnsmasq security update

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

  • dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)
  • dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)
  • dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)
  • dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)
  • dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

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-2026:19373
Updated
2026-11-02
OSVALSA-2026:20589 No score

Important: dnsmasq security update

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

  • dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)
  • dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)
  • dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)
  • dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)
  • dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)

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-2026:20589
Updated
2026-11-02
OSVCLSA-2026-1779294291 No score

dnsmasq: Fix of 3 CVEs

  • CVE-2026-4890: fix NSEC bitmap parsing infinite loop in DNSSEC validation
  • CVE-2026-4891: verify rdlen field in RRSIG packets
  • CVE-2026-4892: fix buffer overflow in helper.c with large DHCPv6 CLIDs
Record
CLSA-2026-1779294291
Updated
2026-11-02
OSVCLSA-2026-1779437548 No score

dnsmasq: Fix of 5 CVEs

  • CVE-2026-2291: fix buffer overflow in union bigname
  • CVE-2026-4890: fix NSEC bitmap parsing infinite loop and OOB reads
  • CVE-2026-4891: verify rdlen field in RRSIG packets
  • CVE-2026-4892: fix buffer overflow in helper.c with large CLIDs
  • CVE-2026-4893: fix broken client subnet validation
Record
CLSA-2026-1779437548
Updated
2026-11-02
OSVCLSA-2026-1779437608 No score

dnsmasq: Fix of 5 CVEs

  • CVE-2026-2291: fix buffer overflow in union bigname
  • CVE-2026-4890: fix NSEC bitmap parsing infinite loop and OOB reads
  • CVE-2026-4891: verify rdlen field in RRSIG packets
  • CVE-2026-4892: fix buffer overflow in helper.c with large CLIDs
  • CVE-2026-4893: fix broken client subnet validation
Record
CLSA-2026-1779437608
Updated
2026-11-02
OSVCLSA-2026-1779455055 No score

dnsmasq: Fix of 5 CVEs

  • CVE-2026-2291: heap OOB write via undersized union bigname buffer
  • CVE-2026-4890: dnssec NSEC bitmap parsing infinite loop
  • CVE-2026-4891: dnssec missing rdlen validation in RRSIG records
  • CVE-2026-4892: helper buffer overflow with large DHCPv6 CLIDs
  • CVE-2026-4893: broken client subnet validation in process_reply
Record
CLSA-2026-1779455055
Updated
2026-11-02
OSVCLSA-2026-1792817189 No score

dnsmasq: Fix of 4 CVEs

  • Build for rhel7els, oraclelinux7els and cloudlinux7els: they get the existing fixes for CVE-2022-0934, CVE-2023-28450, CVE-2026-4890, CVE-2026-4891 and CVE-2026-4892
  • Bump release to sort above Oracle Linux 7 dnsmasq-2.76-17.0.3.el7_9.3
Record
CLSA-2026-1792817189
Updated
2026-11-02
OSVCLSA-2026-1792817408 No score

dnsmasq: Fix of 5 CVEs

  • Build for rhel7els, oraclelinux7els and cloudlinux7els: they get the existing fixes for CVE-2022-0934, CVE-2023-28450, CVE-2026-4890, CVE-2026-4891 and CVE-2026-4892
  • Bump release to sort above Oracle Linux 7 dnsmasq-2.76-17.0.3.el7_9.3
Record
CLSA-2026-1792817408
Updated
2026-11-02
OSVMGASA-2026-0135 No score

Updated dnsmasq packages fix security vulnerabilities

CVE-2026-2291: dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS. CVE-2026-4890: A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet. CVE-2026-4891: A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet. CVE-2026-4892: A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet. CVE-2026-4893: An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information. CVE-2026-5172: A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.

Record
MGASA-2026-0135
Updated
2026-11-02
OSVopenSUSE-SU-2026:10821-1 No score

dnsmasq-2.92rel2-1.1 on GA media

These are all security issues fixed in the dnsmasq-2.92rel2-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10821-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20748-1 No score

Security update for dnsmasq

This update for dnsmasq fixes the following issues

Security issues:

  • CVE-2026-2291: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251).
  • CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  • CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002).
  • CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003).
  • CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004).
  • CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006).
  • CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487).

Non security issues:

  • aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812).
  • Drop rcFOO symlinks for CODE16 (jsc#PED-266.
  • libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934).
  • unknown user or group: dnsmasq with latest proposed dnsmasq update when doing virsh net-start (bsc#1235517).
  • Update to security release 2.92rel2.
Record
openSUSE-SU-2026:20748-1
Updated
2026-11-02
OSVSUSE-SU-2026:1934-1 No score

Security update for dnsmasq

This update for dnsmasq fixes the following issues

Security issues:

  • CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  • CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002).
  • CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003).
  • CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004).
  • CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006).
  • CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487).

Non security issues:

  • Updated to security release 2.92rel2.
  • aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812).
  • Drop rcFOO symlinks for CODE16 (jsc#PED-266).
  • libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934).
Record
SUSE-SU-2026:1934-1
Updated
2026-11-02
OSVSUSE-SU-2026:21640-1 No score

Security update for dnsmasq

This update for dnsmasq fixes the following issues

Security issues:

  • CVE-2026-2291: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251).
  • CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  • CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002).
  • CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003).
  • CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004).
  • CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006).
  • CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487).

Non security issues:

  • aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812).
  • Drop rcFOO symlinks for CODE16 (jsc#PED-266.
  • libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934).
  • unknown user or group: dnsmasq with latest proposed dnsmasq update when doing virsh net-start (bsc#1235517).
  • Update to security release 2.92rel2.
Record
SUSE-SU-2026:21640-1
Updated
2026-11-02
OSVSUSE-SU-2026:21677-1 No score

Security update for dnsmasq

This update for dnsmasq fixes the following issues

Security issues:

  • CVE-2026-2291: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251).
  • CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  • CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002).
  • CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003).
  • CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004).
  • CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006).
  • CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487).

Non security issues:

  • aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812).
  • Drop rcFOO symlinks for CODE16 (jsc#PED-266).
  • libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934).

Changes for dnsmasq:

  • Update to security release 2.92rel2
Record
SUSE-SU-2026:21677-1
Updated
2026-11-02
OSVSUSE-SU-2026:21733-1 No score

Security update for dnsmasq

This update for dnsmasq fixes the following issues

Security issues:

  • CVE-2026-2291: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251).
  • CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  • CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002).
  • CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003).
  • CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004).
  • CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006).
  • CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487).

Non security issues:

  • aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812).
  • Drop rcFOO symlinks for CODE16 (jsc#PED-266).
  • libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934).

Changes for dnsmasq:

  • Update to security release 2.92rel2
Record
SUSE-SU-2026:21733-1
Updated
2026-11-02
OSVSUSE-SU-2026:21788-1 No score

Security update for dnsmasq

This update for dnsmasq fixes the following issues

Security issues:

  • CVE-2026-2291: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251).
  • CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  • CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002).
  • CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003).
  • CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004).
  • CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006).
  • CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487).

Non security issues:

  • aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812).
  • Drop rcFOO symlinks for CODE16 (jsc#PED-266.
  • libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934).
  • unknown user or group: dnsmasq with latest proposed dnsmasq update when doing virsh net-start (bsc#1235517).
  • Update to security release 2.92rel2.
Record
SUSE-SU-2026:21788-1
Updated
2026-11-02
OSVSUSE-SU-2026:2458-1 No score

Security update for dnsmasq

This update for dnsmasq fixes the following issues

  • CVE-2026-2291: VU#471747: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251).
  • CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  • CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002).
  • CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003).
  • CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004).
  • CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006).
  • CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487).

Changes for dnsmasq:

  • Update to security release 2.92rel2.
  • Fix setting of compile time options from the spec file.
Record
SUSE-SU-2026:2458-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
dnsmasq
Alpine:v3.22
 before 2.91-r1
2.91-r1
dnsmasq
Alpine:v3.23
 before 2.91-r1
2.91-r1
dnsmasq
Alpine:v3.24
 before 2.92_p2-r0
2.92_p2-r0
dnsmasq
AlmaLinux:10
From an advisory covering 6 CVEs
 before 2.90-7.el10_2
2.90-7.el10_2
dnsmasq-utils
AlmaLinux:10
From an advisory covering 6 CVEs
 before 2.90-7.el10_2
2.90-7.el10_2
dnsmasq
AlmaLinux:9
From an advisory covering 5 CVEs
 before 2.85-18.el9_8.1
2.85-18.el9_8.1
dnsmasq-utils
AlmaLinux:9
From an advisory covering 5 CVEs
 before 2.85-18.el9_8.1
2.85-18.el9_8.1
dnsmasq
AlmaLinux:8
From an advisory covering 5 CVEs
 before 2.79-36.el8_10
2.79-36.el8_10
dnsmasq-utils
AlmaLinux:8
From an advisory covering 5 CVEs
 before 2.79-36.el8_10
2.79-36.el8_10
dnsmasq
Alpaquita:23
 2.87-r0 up to 2.90-r1
2.90-r1
Show 57 moreShow less
Affected packages
PackageAffectedFixed
dnsmasq
Alpaquita:25
 2.91-r0 up to 2.91-r1
2.91-r1
dnsmasq
Alpaquita:stream
 2.89-r2 up to 2.92_p2-r0
2.92_p2-r0
dnsmasq
TuxCare:CentOS:7
From an advisory covering 3 CVEs
 before 2.76-17.el7_9.3.tuxcare.els4
2.76-17.el7_9.3.tuxcare.els4
dnsmasq-utils
TuxCare:CentOS:7
From an advisory covering 3 CVEs
 before 2.76-17.el7_9.3.tuxcare.els4
2.76-17.el7_9.3.tuxcare.els4
dnsmasq
TuxCare:AlmaLinux:9.6
From an advisory covering 5 CVEs
 before 2.85-17.el9_6.tuxcare.els1
2.85-17.el9_6.tuxcare.els1
dnsmasq-utils
TuxCare:AlmaLinux:9.6
From an advisory covering 5 CVEs
 before 2.85-17.el9_6.tuxcare.els1
2.85-17.el9_6.tuxcare.els1
dnsmasq
TuxCare:CentOS-Stream:8
From an advisory covering 5 CVEs
 before 2.79-33.el8.tuxcare.els1
2.79-33.el8.tuxcare.els1
dnsmasq-utils
TuxCare:CentOS-Stream:8
From an advisory covering 5 CVEs
 before 2.79-33.el8.tuxcare.els1
2.79-33.el8.tuxcare.els1
dnsmasq
TuxCare:AlmaLinux:9.2
From an advisory covering 5 CVEs
 before 2.85-6.el9_2.tuxcare.els3
2.85-6.el9_2.tuxcare.els3
dnsmasq-utils
TuxCare:AlmaLinux:9.2
From an advisory covering 5 CVEs
 before 2.85-6.el9_2.tuxcare.els3
2.85-6.el9_2.tuxcare.els3
dnsmasq
TuxCare:OracleLinux:7
From an advisory covering 5 CVEs
 before 2.76-17.0.3.el7_9.99.tuxcare.els5
2.76-17.0.3.el7_9.99.tuxcare.els5
dnsmasq-utils
TuxCare:OracleLinux:7
From an advisory covering 5 CVEs
 before 2.76-17.0.3.el7_9.99.tuxcare.els5
2.76-17.0.3.el7_9.99.tuxcare.els5
dnsmasq
TuxCare:RHEL:7
From an advisory covering 5 CVEs
 before 2.76-17.0.3.el7_9.99.tuxcare.els5
2.76-17.0.3.el7_9.99.tuxcare.els5
dnsmasq-utils
TuxCare:RHEL:7
From an advisory covering 5 CVEs
 before 2.76-17.0.3.el7_9.99.tuxcare.els5
2.76-17.0.3.el7_9.99.tuxcare.els5
dnsmasq
Debian:12
 before 2.90-4~deb12u2, plus listed versions
2.89-12.90-12.90-22.90-32.90-4~deb12u1
2.90-4~deb12u2
dnsmasq
Debian:13
 before 2.91-1+deb13u1, plus listed versions
2.91-1
2.91-1+deb13u1
dnsmasq
Debian:14
 before 2.92-5, plus listed versions
2.91-12.92-12.92-1+exp12.92-1~exp12.92-2
Show 4 moreShow less
2.92-32.92-42.92~rc1-12.92~rc3-1
2.92-5
dnsmasq
Mageia:9
From an advisory covering 6 CVEs
 before 2.92rel2-1.mga9
2.92rel2-1.mga9
dnsmasq
openEuler:24.03-LTS
From an advisory covering 6 CVEs
 before 2.90-8.oe2403
2.90-8.oe2403
dnsmasq
openEuler:24.03-LTS-SP3
From an advisory covering 6 CVEs
 before 2.90-9.oe2403sp3
2.90-9.oe2403sp3
dnsmasq
openEuler:20.03-LTS-SP4
From an advisory covering 5 CVEs
 before 2.82-21.oe2003sp4
2.82-21.oe2003sp4
dnsmasq
openEuler:22.03-LTS-SP4
From an advisory covering 5 CVEs
 before 2.86-15.oe2203sp4
2.86-15.oe2203sp4
dnsmasq
openEuler:24.03-LTS-SP1
From an advisory covering 6 CVEs
 before 2.90-8.oe2403sp1
2.90-8.oe2403sp1
dnsmasq
Red Hat:enterprise_linux:10.2
From an advisory covering 6 CVEs
 before 0:2.90-7.el10_2
0:2.90-7.el10_2
dnsmasq-debuginfo
Red Hat:enterprise_linux:10.2
From an advisory covering 6 CVEs
 before 0:2.90-7.el10_2
0:2.90-7.el10_2
dnsmasq-debugsource
Red Hat:enterprise_linux:10.2
From an advisory covering 6 CVEs
 before 0:2.90-7.el10_2
0:2.90-7.el10_2
dnsmasq-utils
Red Hat:enterprise_linux:10.2
From an advisory covering 6 CVEs
 before 0:2.90-7.el10_2
0:2.90-7.el10_2
dnsmasq-utils-debuginfo
Red Hat:enterprise_linux:10.2
From an advisory covering 6 CVEs
 before 0:2.90-7.el10_2
0:2.90-7.el10_2
dnsmasq
Red Hat:enterprise_linux:9::appstream
From an advisory covering 5 CVEs
 before 0:2.85-18.el9_8.1
0:2.85-18.el9_8.1
dnsmasq-debuginfo
Red Hat:enterprise_linux:9::appstream
From an advisory covering 5 CVEs
 before 0:2.85-18.el9_8.1
0:2.85-18.el9_8.1
dnsmasq-debugsource
Red Hat:enterprise_linux:9::appstream
From an advisory covering 5 CVEs
 before 0:2.85-18.el9_8.1
0:2.85-18.el9_8.1
dnsmasq-utils
Red Hat:enterprise_linux:9::appstream
From an advisory covering 5 CVEs
 before 0:2.85-18.el9_8.1
0:2.85-18.el9_8.1
dnsmasq-utils-debuginfo
Red Hat:enterprise_linux:9::appstream
From an advisory covering 5 CVEs
 before 0:2.85-18.el9_8.1
0:2.85-18.el9_8.1
dnsmasq
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:2.79-36.el8_10
0:2.79-36.el8_10
dnsmasq-debuginfo
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:2.79-36.el8_10
0:2.79-36.el8_10
dnsmasq-debugsource
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:2.79-36.el8_10
0:2.79-36.el8_10
dnsmasq-utils
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:2.79-36.el8_10
0:2.79-36.el8_10
dnsmasq-utils-debuginfo
Red Hat:enterprise_linux:8::appstream
From an advisory covering 5 CVEs
 before 0:2.79-36.el8_10
0:2.79-36.el8_10
dnsmasq
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 5 CVEs
 before 0:2.85-17.el9_6.1
0:2.85-17.el9_6.1
dnsmasq-debuginfo
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 5 CVEs
 before 0:2.85-17.el9_6.1
0:2.85-17.el9_6.1
dnsmasq-debugsource
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 5 CVEs
 before 0:2.85-17.el9_6.1
0:2.85-17.el9_6.1
dnsmasq-utils
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 5 CVEs
 before 0:2.85-17.el9_6.1
0:2.85-17.el9_6.1
dnsmasq-utils-debuginfo
Red Hat:rhel_eus:9.6::appstream
From an advisory covering 5 CVEs
 before 0:2.85-17.el9_6.1
0:2.85-17.el9_6.1
dnsmasq
Rocky Linux:10
From an advisory covering 6 CVEs
 before 0:2.90-7.el10_2
0:2.90-7.el10_2
dnsmasq
Rocky Linux:9
From an advisory covering 5 CVEs
 before 0:2.85-18.el9_8.1
0:2.85-18.el9_8.1
dnsmasq
Rocky Linux:8
From an advisory covering 5 CVEs
 before 0:2.79-36.el8_10
0:2.79-36.el8_10
dnsmasq
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 7 CVEs
 before 2.92rel2-18.27.1
2.92rel2-18.27.1
dnsmasq
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 7 CVEs
 before 2.92rel2-18.27.1
2.92rel2-18.27.1
dnsmasq
Ubuntu:Pro:14.04:LTS
 before 2.68-1ubuntu0.2+esm5, plus listed versions
2.66-4ubuntu12.67-12.68-12.68-1ubuntu0.12.68-1ubuntu0.22.68-1ubuntu0.2+esm12.68-1ubuntu0.2+esm22.68-1ubuntu0.2+esm3
2.68-1ubuntu0.2+esm5
dnsmasq
Ubuntu:Pro:16.04:LTS
 before 2.90-0ubuntu0.16.04.1+esm3, plus listed versions
2.75-12.75-1ubuntu0.16.04.12.75-1ubuntu0.16.04.22.75-1ubuntu0.16.04.32.75-1ubuntu0.16.04.4
Show 8 moreShow less
2.75-1ubuntu0.16.04.52.75-1ubuntu0.16.04.72.75-1ubuntu0.16.04.82.75-1ubuntu0.16.04.102.75-1ubuntu0.16.04.10+esm12.79-1ubuntu0.16.04.1+esm12.79-1ubuntu0.16.04.1+esm22.90-0ubuntu0.16.04.1+esm1
2.90-0ubuntu0.16.04.1+esm3
dnsmasq
Ubuntu:Pro:18.04:LTS
 before 2.90-0ubuntu0.18.04.1+esm3, plus listed versions
2.78-12.78-32.79-12.79-1ubuntu0.22.79-1ubuntu0.3
Show 5 moreShow less
2.79-1ubuntu0.42.79-1ubuntu0.52.79-1ubuntu0.62.79-1ubuntu0.72.90-0ubuntu0.18.04.1+esm1
2.90-0ubuntu0.18.04.1+esm3
dnsmasq
Ubuntu:Pro:20.04:LTS
 before 2.90-0ubuntu0.20.04.1+esm2, plus listed versions
2.80-1ubuntu22.80-1ubuntu42.80-1.1ubuntu12.80-1.1ubuntu1.22.80-1.1ubuntu1.3
Show 5 moreShow less
2.80-1.1ubuntu1.42.80-1.1ubuntu1.52.80-1.1ubuntu1.62.80-1.1ubuntu1.72.90-0ubuntu0.20.04.1
2.90-0ubuntu0.20.04.1+esm2
dnsmasq
Ubuntu:22.04:LTS
 before 2.90-0ubuntu0.22.04.3, plus listed versions
2.85-1ubuntu22.86-1.12.86-1.1ubuntu0.12.86-1.1ubuntu0.22.86-1.1ubuntu0.32.86-1.1ubuntu0.42.86-1.1ubuntu0.52.90-0ubuntu0.22.04.1
2.90-0ubuntu0.22.04.3
dnsmasq
Ubuntu:24.04:LTS
 before 2.90-2ubuntu0.3, plus listed versions
2.89-12.90-22.90-2build12.90-2build22.90-2ubuntu0.1
2.90-2ubuntu0.3
dnsmasq
Ubuntu:25.10
 before 2.91-1ubuntu0.2, plus listed versions
2.91-12.91-1build1
2.91-1ubuntu0.2
dnsmasq
Ubuntu:26.04:LTS
 before 2.92-1ubuntu0.2, plus listed versions
2.91-1build12.92~rc3-12.92-1
2.92-1ubuntu0.2
dnsmasq
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 2.92rel2-1.1
2.92rel2-1.1

History

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

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

In short

CVE-2026-4892 is a high vulnerability (CVSS 8.4) in Dnsmasq, published May 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.81%, the 57th percentile. Fixed in dnsmasq 2.91-r1.

References

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