Vulnerabilities CVE-2026-28780

CVE-2026-28780

Critical

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 9.8
EPSS Score ⓘ: 1.38%

69.6th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Confidence: 90%
Published: May 5, 2026
Last Modified: Jul 28, 2026

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