Critical severity9.8NVD Advisory· Published May 5, 2026· Updated May 6, 2026
CVE-2026-28780
CVE-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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
30- osv-coords29 versionspkg:bitnami/apachepkg:rpm/almalinux/httpdpkg:rpm/almalinux/httpd-corepkg:rpm/almalinux/httpd-develpkg:rpm/almalinux/httpd-filesystempkg:rpm/almalinux/httpd-manualpkg:rpm/almalinux/httpd-toolspkg:rpm/almalinux/mod_http2pkg:rpm/almalinux/mod_ldappkg:rpm/almalinux/mod_luapkg:rpm/almalinux/mod_mdpkg:rpm/almalinux/mod_proxy_htmlpkg:rpm/almalinux/mod_sessionpkg:rpm/almalinux/mod_sslpkg:rpm/opensuse/apache2&distro=openSUSE%20Tumbleweedpkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-devel&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-event&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-manual&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-manual&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-prefork&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-utils&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/apache2-worker&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 2.4.67+ 28 more
- (no CPE)range: < 2.4.67
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 1.15.7-10.module_el8.10.0+4185+0955a0d7.5
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2
- (no CPE)range: < 1:2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.62-13.el9_8.1
- (no CPE)range: < 1:2.4.62-13.el9_8.1
- (no CPE)range: < 2.4.67-1.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
- (no CPE)range: < 2.4.66-160000.2.1
Patches
Vulnerability mechanics
References
2- www.openwall.com/lists/oss-security/2026/05/05/9nvdMailing ListThird Party Advisory
- httpd.apache.org/security/vulnerabilities_24.htmlnvdRelease NotesVendor Advisory
News mentions
1- Critical, High-Severity Vulnerabilities Patched in Apache MINA, HTTP ServerSecurityWeek · May 5, 2026