CVE-2026-28780

critical

Published 2026-05-05 · Modified 2026-05-06

CVSS v3

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2

—

VIR risk

9.8

Description

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Predictions

Exploit likelihood

97%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-28780.html

vendor Authored 2026-05-27

Vendor advisory: security@apache.org — https://httpd.apache.org/security/vulnerabilities_24.html

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-28780

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`2.4.67-1~deb12u2`
debian	bullseye	fixed	`2.4.67-1~deb11u1`
debian	forky	fixed	`2.4.67-1`
debian	sid	fixed	`2.4.67-1`
debian	trixie	fixed	`2.4.67-1~deb13u2`
sles		affected

Application impact

Vendor	Product	Versions	Fixed
apache	http_server	`{"endExcluding":"2.4.67"}`	`2.4.67`

References

CWEs

CWE-122

Verify integrity in audit chain (admin only). AS-IS.