| Name | CVE-2026-23918 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1135737 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| apache2 (PTS) | bullseye | 2.4.62-1~deb11u1 | fixed |
| bullseye (security) | 2.4.67-1~deb11u1 | fixed |
| bookworm | 2.4.66-1~deb12u1 | vulnerable |
| bookworm (security) | 2.4.67-1~deb12u2 | fixed |
| trixie | 2.4.66-1~deb13u2 | fixed |
| trixie (security) | 2.4.67-1~deb13u2 | fixed |
| forky | 2.4.66-8 | fixed |
| sid | 2.4.67-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| apache2 | source | bullseye | (not affected) | | | |
| apache2 | source | bookworm | 2.4.67-1~deb12u2 | | | |
| apache2 | source | trixie | 2.4.66-1~deb13u2 | | | |
| apache2 | source | (unstable) | 2.4.66-5 | | | 1135737 |
Notes
[bullseye] - apache2 <not-affected> (No Debian released version in bullseye was affected by the HTTP/2 regression)
https://www.openwall.com/lists/oss-security/2026/05/04/19
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2026-23918
https://github.com/apache/httpd/commit/e41e84e08e6186460e77a8357b5d5c571d33bd76 (2.4.67-rc1-candidate)
https://eissing.org/icing/posts/responsible-disclosure/