MEDIUM 6.5 Microsoft

CVE-2026-33523

Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line

Microsoft Security Update 2026-May: Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line

Affected Products

cbl2 httpd 2.4.66-1 on CBL Mariner 2.0
azl3 httpd 2.4.66-1 on Azure Linux 3.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33523
https://nvd.nist.gov/vuln/detail/CVE-2026-33523

Published: 2026-05-12 · Source: Microsoft · Feed updated: 2026-08-04

This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-05-12 via Microsoft. Affected: cbl2 httpd 2.4.66-1 on CBL Mariner 2.0, azl3 httpd 2.4.66-1 on Azure Linux 3.0.

vulnfeed aggregates 9214 vulnerabilities from NVD, CISA KEV, Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.