CVE-2026-33523

medium

Published 2026-05-04 · Modified 2026-05-04

CVSS v3

6.5

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

CVSS v2

—

VIR risk

6.5

Description

HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Predictions

Exploit likelihood

75%

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-2026-33523.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-2026-33523

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	`{"startIncluding":"2.4.0","endExcluding":"2.4.67"}`	`2.4.67`

References

CWEs

CWE-443

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