CVE-2026-28780

9.8 criticalEPSS 1.4%

Critical (9.8) in apache http server. EPSS 1.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.4% chance of exploitation in the next 30 days; higher than 72% of CVEs (scores of 2026-10-31)
CWEs: CWE-122, CWE-787
Published: 2026-05-05
Modified: 2026-09-14
Record from: the NVD, synced 2026-10-19

Affected

apache:http_server

References

https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2026/05/05/9
https://access.redhat.com/errata/RHSA-2026:21391
https://access.redhat.com/errata/RHSA-2026:21433
https://access.redhat.com/errata/RHSA-2026:22140

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