CVE-2026-28780CRITICAL 9.8EPSS p46.8%

CVE-2026-28780CVE-2026-28780

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.66% probability of exploitation · percentile 46.8% · 2026-06-18T12:00:27Z
Published2026-05-05
Last modified2026-05-06

Underlying weaknesses· 1

CWE-122

References

  1. https://httpd.apache.org/security/vulnerabilities_24.html
  2. http://www.openwall.com/lists/oss-security/2026/05/05/9

1

TypeTargetConfidenceTier
WeaknessHeap-based Buffer Overflowcwe-1220%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.