CVE-2026-28780
CRITICAL9.8EPSS 0.03%Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()
Published: 5/5/2026Modified: 5/14/2026
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.
Affected packages (3)
- Alpine/apache2from 0, < 2.4.67-r0
- Bitnami/apachefrom 0, < 2.4.67
- Debian/apache2from 0, < 2.4.67-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |