Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-28780US | — | — | ||
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 messag… | ||||
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references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/05/05/9ADVISORY
- https://access.redhat.com/errata/RHSA-2026:21391WEB
- https://access.redhat.com/errata/RHSA-2026:21433WEB
- https://access.redhat.com/errata/RHSA-2026:22140WEB
- https://access.redhat.com/errata/RHSA-2026:27200WEB
- https://access.redhat.com/errata/RHSA-2026:27201WEB
- https://access.redhat.com/errata/RHSA-2026:36373WEB
- https://access.redhat.com/errata/RHSA-2026:36831WEB
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