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

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Summary

CVECVE-2026-28780
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-05 22:16:00 UTC
Updated2026-05-05 23:16:17 UTC
DescriptionHeap-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.

Risk And Classification

Problem Types: CWE-122 | CWE-122 CWE-122 Heap-based Buffer Overflow

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache HTTP Server affected 2.4.66 semver Not specified

References

ReferenceSourceLinkTags
httpd.apache.org/security/vulnerabilities_24.html [email protected] httpd.apache.org
www.openwall.com/lists/oss-security/2026/05/05/9 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Andrew Lacambra (en)

CNA: Elhanan Haenel (en)

CNA: Tianshuo Han (<[email protected]>) (en)

CNA: Tristan Madani (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-02-04T12:00:00.000Zreported
CNA2026-03-18T12:00:00.000Zreported by 3rd finder
CNA2026-02-28T12:00:00.000Zreported by 2nd finder
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