CVE-2026-28780

CRITICAL

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

Title source: cna
STIX 2.1

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.

References (13)

Core 13
Core References

Scores

CVSS v3 9.8
EPSS 0.0138
EPSS Percentile 68.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-122 CWE-787
Status published
Products (2)
apache/http_server < 2.4.67
Apache Software Foundation/Apache HTTP Server < 2.4.66
Published May 05, 2026
Tracked Since May 06, 2026