CVE-2026-28780

CRITICAL9.8

Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()

Published May 5, 2026

Modified 2 weeks ago

Details

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.

References

WEB

http://www.openwall.com/lists/oss-security/2026/05/05/9

ADVISORY

https://httpd.apache.org/security/vulnerabilities_24.html

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-28780

CVSS Analysis

CVSS v3.1

9.8