| Name | CVE-2026-33857 |
| Description | Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 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) |
| References | DLA-4571-1, DSA-6248-1 |
| 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 | vulnerable |
| 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 | vulnerable |
| trixie (security) | 2.4.67-1~deb13u2 | fixed |
| forky | 2.4.66-8 | vulnerable |
| sid | 2.4.67-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://www.openwall.com/lists/oss-security/2026/05/04/15
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2026-33857
https://github.com/apache/httpd/commit/493eb23e5cc18c3a7be53977c182ff5d1360c64c (2.4.67-rc1-candidate)