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CVE-2026-23918

Apache HTTP Server: http2: double free and possible RCE on early reset

8.8 HighPublic exploitFix available

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

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
High
Integrity
High
Availability
High

Exploit likelihood

49.7%Up 49.7 points since May 5, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.8

Apache HTTP Server: http2: double free and possible RCE on early reset

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
CVE-2026-23918
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-415, CWE-1341
Updated
2026-11-02
EUVDEUVD-2026-26955 8.8

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
EUVD-2026-26955
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-p8fm-9c82-pw4g 8.8

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This...

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
GHSA-p8fm-9c82-pw4g
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-415, CWE-1341
Updated
2026-11-02
NVD 8.8

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
CVE-2026-23918
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-415, CWE-1341
Updated
2026-11-02
OSVALPINE-CVE-2026-23918 8.8

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
ALPINE-CVE-2026-23918
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBELL-CVE-2026-23918 8.8
Record
BELL-CVE-2026-23918
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 19 moreShow less
OSV 8.8

Apache HTTP Server: http2: double free and possible RCE on early reset

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
CVE-2026-23918
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-415
Updated
2026-11-02
OSVDEBIAN-CVE-2026-23918 8.8

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
DEBIAN-CVE-2026-23918
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2026:13938 8.8

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:13938
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-23918 8.8

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
UBUNTU-CVE-2026-23918
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVAZL-86004 No score

CVE-2026-23918 affecting package httpd for versions less than 2.4.67-1

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
AZL-86004
Updated
2026-11-02
OSVBIT-apache-2026-23918 No score

Apache HTTP Server: http2: double free and possible RCE on early reset

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.

This issue affects Apache HTTP Server: 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Record
BIT-apache-2026-23918
Updated
2026-11-02
OSVCLSA-2026-1778054005 No score

Fix CVE(s): CVE-2026-23918

  • SECURITY UPDATE: double free and possible remote code execution via HTTP/2 stream double-purge in mod_http2
    • debian/patches/CVE-2026-23918.patch: prevent double purge of a stream by introducing add_for_purge() helper that checks for duplicates before adding to the purge queue in modules/http2/h2_mplx.c
    • CVE-2026-23918
Record
CLSA-2026-1778054005
Updated
2026-11-02
OSVCLSA-2026-1778070287 No score

mod_http2: Fix of CVE-2026-23918

  • CVE-2026-23918: fix double free via double stream purge in mod_http2
Record
CLSA-2026-1778070287
Updated
2026-11-02
OSVCLSA-2026-1778107205 No score

Fix CVE(s): CVE-2026-23918

  • SECURITY UPDATE: double free / possible RCE in mod_http2 stream purge
    • debian/patches/CVE-2026-23918.patch: deduplicate inserts into the spurge array in modules/http2/h2_mplx.c via a new add_for_purge() helper to prevent the same h2_stream from being freed twice.
    • CVE-2026-23918
Record
CLSA-2026-1778107205
Updated
2026-11-02
OSVMGASA-2026-0129 No score

Updated apache packages fix security vulnerabilities

http2: double free and possible RCE on early reset. (CVE-2026-23918) mod_rewrite elevation of privileges via ap_expr. (CVE-2026-24072) buffer overflow in mod_proxy_ajp via ajp_msg_check_header(). (CVE-2026-28780) mod_md unrestricted OCSP response. (CVE-2026-29168) mod_dav_lock indirect lock crash. (CVE-2026-29169) mod_auth_digest timing attack. (CVE-2026-33006) mod_authn_socache crash. (CVE-2026-33007) HTTP response splitting forwarding malicious status line. (CVE-2026-33523) Off-by-one OOB reads in AJP getter functions. (CVE-2026-33857) Heap Buffer Over-Read Due to Missing Null-Termination Check (ajp_msg_get_string). (CVE-2026-34032) Heap Over-Read and memory disclosure in ajp_parse_data(). (CVE-2026-34059)

Record
MGASA-2026-0129
Updated
2026-11-02
OSVopenSUSE-SU-2026:10785-1 No score

apache2-2.4.67-1.1 on GA media

These are all security issues fixed in the apache2-2.4.67-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10785-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21115-1 No score

Security update for apache2

This update for apache2 fixes the following issues

  • CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
  • CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
  • CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
  • CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
  • CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
  • CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
  • CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
  • CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
  • CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
  • CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
  • CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
Record
openSUSE-SU-2026:21115-1
Updated
2026-11-02
OSVSUSE-SU-2026:2103-1 No score

Security update for apache2

This update for apache2 fixes the following issues

  • CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
  • CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
  • CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
  • CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
  • CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
  • CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
  • CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
  • CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
  • CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
  • CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
  • CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
Record
SUSE-SU-2026:2103-1
Updated
2026-11-02
OSVSUSE-SU-2026:2104-1 No score

Security update for apache2

This update for apache2 fixes the following issues

  • CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
  • CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
  • CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
  • CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
  • CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
  • CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
  • CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
  • CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
  • CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
  • CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
  • CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
Record
SUSE-SU-2026:2104-1
Updated
2026-11-02
OSVSUSE-SU-2026:22199-1 No score

Security update for apache2

This update for apache2 fixes the following issues

  • CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
  • CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
  • CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
  • CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
  • CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
  • CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
  • CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
  • CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
  • CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
  • CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
  • CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
Record
SUSE-SU-2026:22199-1
Updated
2026-11-02
OSVSUSE-SU-2026:22209-1 No score

Security update for apache2

This update for apache2 fixes the following issues

  • CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
  • CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
  • CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
  • CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
  • CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
  • CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
  • CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
  • CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
  • CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
  • CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
  • CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
Record
SUSE-SU-2026:22209-1
Updated
2026-11-02
OSVSUSE-SU-2026:2641-1 No score

Security update for apache2

This update for apache2 fixes the following issues

Update to 2.4.66 (jsc#PED-16334):

Security issues:

  • CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
  • CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
  • CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
  • CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
  • CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
  • CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
  • CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
  • CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
  • CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
  • CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
  • CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).

Non security issue:

  • Internal server error on very long URL (bsc#690734).
Record
SUSE-SU-2026:2641-1
Updated
2026-11-02
OSVSUSE-SU-2026:2686-1 No score

Security update for apache2

This update for apache2 fixes the following issues

  • CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
  • CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
  • CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
  • CVE-2026-29167: mod_ldap per-dir use-after-free (bsc#1267976).
  • CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
  • CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
  • CVE-2026-29170: mod_proxy_ftp XSS (bsc#1267977).
  • CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
  • CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
  • CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
  • CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
  • CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
  • CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
  • CVE-2026-34355: mod_proxy_html buffer overflow (bsc#1267978).
  • CVE-2026-34356: malicious backend servers can lead to a heap-based buffer overflow (bsc#1267955).
  • CVE-2026-42535: malicious path manipulation can lead to child process crashes (bsc#1267956).
  • CVE-2026-42536: processing untrusted content can lead to a heap-based buffer overflow (bsc#1267962).
  • CVE-2026-43951: out-of-bound read in merge_response_headers can cause crash (bsc#1267963).
  • CVE-2026-44119: improper privilege management can lead to an unauthorized read (bsc#1267965).
  • CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP send_request (bsc#1267969).
  • CVE-2026-44186: responses from an attacker-controlled FTP backend can lead to resource exhaustion and a denial of service (bsc#1267970).
  • CVE-2026-44631: crafted regular expression can lead to a buffer underwrite (bsc#1267971).
  • CVE-2026-48913: file handle exhaustion during request processing in mod_http2 can lead to a use-after-free (bsc#1267972).
  • CVE-2026-49975: Fix cookie header accounting against LimitRequestFields (bsc#1267503).

Non security issue:

  • Update to 2.4.66 (jsc#PED-16334).
Record
SUSE-SU-2026:2686-1
Updated
2026-11-02
OSVUSN-8239-1 No score

apache2 vulnerabilities

Bartlomiej Dmitruk and Stanislaw Strzalkowski discovered that Apache HTTP Server incorrectly handled certain memory operations when using the HTTP/2 protocol. A remote attacker could use this issue to cause Apache HTTP Server to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-23918)

It was discovered that the Apache HTTP Server mod_rewrite module incorrectly handled certain privileges. A local attacker could possibly use this issue to obtain sensitive information. (CVE-2026-24072)

Andrew Lacambra, Elhanan Haenel, Tianshuo Han, and Tristan Madani discovered that the Apache HTTP Server mod_proxy_ajp module incorrectly handled certain AJP server messages. An attacker in control of a backend AJP server could use this issue to cause Apache HTTP Server to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-28780)

Pavel Kohout discovered that Apache HTTP Server did not properly limit resource allocation in mod_md when processing OCSP response data. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-29168)

Pavel Kohout discovered that the Apache HTTP Server incorrectly handled certain memory operations in mod_dav_lock. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-29169)

Nitescu Lucian discovered that Apache HTTP Server had a timing attack vulnerability in mod_auth_digest. A remote attacker could possibly use this issue to bypass Digest authentication. (CVE-2026-33006)

Pavel Kohout and Arkadi Vainbrand discovered that Apache HTTP Server incorrectly handled certain memory operations in mod_authn_socache. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-33007)

Haruki Oyama, Merih Mengisteab, and Dawit Jeong discovered that Apache HTTP Server had an HTTP response splitting vulnerability in multiple modules when used with untrusted or compromised backend servers. An attacker could possibly use this issue to inject arbitrary HTTP headers. (CVE-2026-33523)

Elhanan Haenel discovered that Apache HTTP Server incorrectly handled certain memory operations in mod_proxy_ajp. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-33857)

Tianshuo Han and Jérôme Djouder discovered that Apache HTTP Server incorrectly handled certain string operations in mod_proxy_ajp. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-34032)

Elhanan Haenel discovered that Apache HTTP Server incorrectly handled certain memory operations in mod_proxy_ajp. A remote attacker could use this issue to cause Apache HTTP Server to crash, resulting in a denial of service, or possibly obtain sensitive information. (CVE-2026-34059)

Record
USN-8239-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
apache2
Alpine:v3.20
 before 2.4.67-r0
2.4.67-r0
apache2
Alpine:v3.21
 before 2.4.67-r0
2.4.67-r0
apache2
Alpine:v3.22
 before 2.4.67-r0
2.4.67-r0
apache2
Alpine:v3.23
 before 2.4.67-r0
2.4.67-r0
apache2
Alpine:v3.24
 before 2.4.67-r0
2.4.67-r0
httpd
Azure Linux:3
 before 2.4.67-1
2.4.67-1
apache2
Alpaquita:23
 2.4.54-r2 up to 2.4.67-r0
2.4.67-r0
apache2
Alpaquita:25
 2.4.63-r0 up to 2.4.67-r0
2.4.67-r0
apache2
Alpaquita:stream
 2.4.56-r0 up to 2.4.67-r0
2.4.67-r0
apache
Bitnami
 2.4.66 up to 2.4.67
2.4.67
Show 71 moreShow less
Affected packages
PackageAffectedFixed
apache2
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-bin
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-data
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-dev
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-doc
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-ssl-dev
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-suexec-custom
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-suexec-pristine
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
apache2-utils
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
libapache2-mod-md
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
libapache2-mod-proxy-uwsgi
TuxCare:Ubuntu:20.04
 before 2.4.41-4ubuntu3.23+tuxcare.els3
2.4.41-4ubuntu3.23+tuxcare.els3
mod_http2
TuxCare:AlmaLinux:9.6
 before 2.0.26-4.el9_6.1.tuxcare.els1
2.0.26-4.el9_6.1.tuxcare.els1
apache2
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-bin
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-data
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-dev
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-doc
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-ssl-dev
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-suexec-custom
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-suexec-pristine
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2-utils
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
libapache2-mod-md
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
libapache2-mod-proxy-uwsgi
TuxCare:Debian:10
 before 2.4.59-1~deb10u1+tuxcare.els4
2.4.59-1~deb10u1+tuxcare.els4
apache2
Debian:12
 before 2.4.67-1~deb12u2, plus listed versions
2.4.57-22.4.57-32.4.58-12.4.59-12.4.59-1~deb10u1
Show 41 moreShow less
2.4.59-1~deb11u12.4.59-1~deb12u12.4.59-22.4.60-12.4.61-12.4.61-1~deb11u12.4.61-1~deb12u12.4.62-12.4.62-1~deb11u12.4.62-1~deb11u22.4.62-1~deb12u12.4.62-1~deb12u22.4.62-22.4.62-32.4.62-42.4.62-52.4.62-62.4.63-12.4.64-12.4.65-12.4.65-1~deb11u12.4.65-1~deb12u12.4.65-22.4.65-32.4.66-12.4.66-1~deb11u12.4.66-1~deb12u12.4.66-1~deb12u22.4.66-1~deb13u12.4.66-1~deb13u22.4.66-22.4.66-32.4.66-42.4.66-52.4.66-62.4.66-72.4.66-82.4.67-1~deb11u12.4.67-1~deb11u22.4.67-1~deb11u32.4.67-1~deb12u1
2.4.67-1~deb12u2
apache2
Debian:13
 before 2.4.66-1~deb13u2, plus listed versions
2.4.65-22.4.65-32.4.66-1~deb11u12.4.66-1~deb12u12.4.66-1~deb12u22.4.66-1~deb13u1
2.4.66-1~deb13u2
apache2
Debian:14
 before 2.4.66-5, plus listed versions
2.4.65-22.4.65-32.4.66-12.4.66-1~deb11u12.4.66-1~deb12u1
Show 6 moreShow less
2.4.66-1~deb12u22.4.66-1~deb13u12.4.66-1~deb13u22.4.66-22.4.66-32.4.66-4
2.4.66-5
apache
Mageia:9
From an advisory covering 11 CVEs
 before 2.4.67-1.mga9
2.4.67-1.mga9
httpd
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.4.67-0.1.hum1
0:2.4.67-0.1.hum1
httpd-core
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.4.67-0.1.hum1
0:2.4.67-0.1.hum1
httpd-devel
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.4.67-0.1.hum1
0:2.4.67-0.1.hum1
httpd-filesystem
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.4.67-0.1.hum1
0:2.4.67-0.1.hum1
httpd-manual
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.4.67-0.1.hum1
0:2.4.67-0.1.hum1
httpd-tools
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.4.67-0.1.hum1
0:2.4.67-0.1.hum1
apache2
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-devel
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-event
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-manual
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-prefork
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-utils
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-worker
SUSE:Linux Enterprise Server 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-devel
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-event
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-manual
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-prefork
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-utils
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-worker
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 11 CVEs
 before 2.4.66-35.78.1
2.4.66-35.78.1
apache2-tls13
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 11 CVEs
 before 2.4.66-35.78.1
2.4.66-35.78.1
apache2
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 11 CVEs
 before 2.4.66-35.78.1
2.4.66-35.78.1
apache2-tls13
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 11 CVEs
 before 2.4.66-35.78.1
2.4.66-35.78.1
apache2
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
SUSE:Linux Enterprise Server 15 SP4-LTSS
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
SUSE:Linux Enterprise Server 15 SP5-LTSS
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
From an advisory covering 66 CVEs
 before 2.4.66-150400.6.57.1
2.4.66-150400.6.57.1
apache2
Ubuntu:26.04:LTS
 before 2.4.66-2ubuntu2.1, plus listed versions
2.4.64-1ubuntu32.4.65-3ubuntu12.4.66-2ubuntu12.4.66-2ubuntu2
2.4.66-2ubuntu2.1
apache2
Ubuntu:22.04:LTS
 before 2.4.52-1ubuntu4.20, plus listed versions
2.4.48-3.1ubuntu32.4.48-3.1ubuntu42.4.51-2ubuntu12.4.52-1ubuntu12.4.52-1ubuntu2
Show 19 moreShow less
2.4.52-1ubuntu42.4.52-1ubuntu4.12.4.52-1ubuntu4.22.4.52-1ubuntu4.32.4.52-1ubuntu4.42.4.52-1ubuntu4.52.4.52-1ubuntu4.62.4.52-1ubuntu4.72.4.52-1ubuntu4.82.4.52-1ubuntu4.92.4.52-1ubuntu4.102.4.52-1ubuntu4.112.4.52-1ubuntu4.122.4.52-1ubuntu4.132.4.52-1ubuntu4.142.4.52-1ubuntu4.152.4.52-1ubuntu4.162.4.52-1ubuntu4.182.4.52-1ubuntu4.19
2.4.52-1ubuntu4.20
apache2
Ubuntu:24.04:LTS
 before 2.4.58-1ubuntu8.12, plus listed versions
2.4.57-2ubuntu22.4.57-2ubuntu32.4.58-1ubuntu12.4.58-1ubuntu22.4.58-1ubuntu6
Show 12 moreShow less
2.4.58-1ubuntu72.4.58-1ubuntu82.4.58-1ubuntu8.12.4.58-1ubuntu8.22.4.58-1ubuntu8.32.4.58-1ubuntu8.42.4.58-1ubuntu8.52.4.58-1ubuntu8.62.4.58-1ubuntu8.72.4.58-1ubuntu8.82.4.58-1ubuntu8.102.4.58-1ubuntu8.11
2.4.58-1ubuntu8.12
apache2
Ubuntu:25.10
 before 2.4.64-1ubuntu3.4, plus listed versions
2.4.63-1ubuntu12.4.63-1ubuntu32.4.64-1ubuntu22.4.64-1ubuntu32.4.64-1ubuntu3.22.4.64-1ubuntu3.3
2.4.64-1ubuntu3.4
apache2
openSUSE:Tumbleweed
From an advisory covering 11 CVEs
 before 2.4.67-1.1
2.4.67-1.1
apache2
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-devel
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-event
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-manual
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-prefork
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-utils
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1
apache2-worker
openSUSE:Leap 16.0
From an advisory covering 11 CVEs
 before 2.4.66-160000.2.1
2.4.66-160000.2.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHub12lie20/CVE-2026-23918-test2026-05-05
PoC in GitHubaa022/CVE-2026-23918-Passive-Audit2026-05-05
PoC in GitHubqassam-315/CVE-2026-23918-Elite-Auditor2026-05-05
PoC in GitHubrshosting/Apache-CVE-2026-23918-fix2026-05-05
PoC in GitHubCYFARE/CVE-2026-23918-Apache-HTTP-Server-DoubleFree-PoC2026-05-06
PoC in GitHubhackervlogofficial/CVE-2026-239182026-05-06
PoC in GitHubrhasan-com/CVE-2026-239182026-05-06
PoC in GitHubseguridadentrerios/CVE-2026-239182026-05-06
PoC in GitHubxeloxa/CVE-2026-23918-Apache-H2-PoC2026-05-06
PoC in GitHubalt3kx/CVE-2026-239182026-05-07
Show 6 moreShow less
Public exploits
SourceLinkDate
PoC in GitHubinsomnisec/Detections-CVE-2026-239182026-05-08
PoC in GitHubstriga-ai/CVE-2026-239182026-05-11
PoC in GitHubBencodin/CVE-2026-23918-poc2026-05-13
PoC in GitHubsibersan/apache_audit_cve-2026-239182026-05-16
Exploit-DBApache HTTP Server 2.4.66 - 'mod_http2' Double-Free Denial of Service2026-05-26
PoC in GitHubgagaltotal/CVE-2026-23918-Double-free-Apache-httpd-mod_http22026-06-28

History

History
RecordedChangedSources
affected, exploits, facts
affected, aliases, publishedEUVD
first indexedCVE List, Exploit-DB, GitHub Advisories, NVD, OSV, PoC in GitHub

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

In short

CVE-2026-23918 is a high vulnerability (CVSS 8.8) in Apache Http Server, published May 4, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 49.7%, the 98th percentile. Fixed in apache2 2.4.67-r0.

References

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