CVE-2026-28780: Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header
This Apache advisory covers CVE-2026-28780 in Apache HTTP Server.
Key facts
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Apache HTTP Server through 2.4.66
- Fixed in
- 2.4.67
- Source published
- Source revised
- Listed by VulniPulse
- Record changed
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
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.
Text from the source record.
- Apache HTTP Server through 2.4.66
Official advisory · medium-confidence parse· fetched ·verify at source
How to fix CVE-2026-28780
Upgrade to a fixed release named by Apache:
- 2.4.67
Vendor guidance
- Users are recommended to upgrade to version 2.4.67, which fixes the issue.
End-of-life dates for Apache HTTP Server
CVE-2026-28780 in other vendors' advisories
- NetApp: NTAP-20260508-0007, critical severity
- Red Hat: CVE-2026-28780, high severity, fixed in RHSA-2026:27200
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