CVE-2026-28780
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.
- Score
- CVSS 3.1 9.8 Critical
- Status
- Modified - security@apache.org
- Published
- 2026-05-05
- Last modified
- 2026-09-14
- Weaknesses
- CWE-122, CWE-787
Affected products
- Http Server (Apache)
- Apache Http Server (Apache Software Foundation)
- Enterprise Linux (Redhat)
- Enterprise Linux Eus (Redhat)
- Jboss Core Services (Redhat)
- Rhel Aus (Redhat)
- Rhel E4s (Redhat)
- Rhel Eus (Redhat)
- Rhel Eus Long Life (Redhat)
- Rhel Tus (Redhat)
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
- https://access.redhat.com/errata/RHSA-2026:27200
- https://access.redhat.com/errata/RHSA-2026:27201
- https://access.redhat.com/errata/RHSA-2026:36373
- https://access.redhat.com/errata/RHSA-2026:36831
- https://access.redhat.com/errata/RHSA-2026:36846
- https://access.redhat.com/errata/RHSA-2026:47046
- https://access.redhat.com/errata/RHSA-2026:62165
- https://access.redhat.com/errata/RHSA-2026:66323
- https://access.redhat.com/errata/RHSA-2026:67152
- https://access.redhat.com/security/cve/CVE-2026-28780
- https://bugzilla.redhat.com/show_bug.cgi?id=2466913
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28780.json
