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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://httpd.apache.org/security/vulnerabilities_24.html	Release Notes Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/05/9	Mailing List Third Party Advisory
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

Configurations

Configuration 1 (hide)

cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-05 22:16

Updated : 2026-09-14 13:17

NVD link : CVE-2026-28780

Mitre link : CVE-2026-28780

CVE.ORG link : CVE-2026-28780

JSON object : View

Products Affected

apache

http_server

CWE

CWE-122

Heap-based Buffer Overflow

CWE-787

Out-of-bounds Write

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"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28780.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-122"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server.\nIf 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.\n\nThis issue affects Apache HTTP Server: through 2.4.66.\n\nUsers are recommended to upgrade to version 2.4.67, which fixes the issue."}, {"lang": "es", "value": "Vulnerabilidad de desbordamiento de b\u00fafer basado en mont\u00edculo en mod_proxy_ajp del Servidor HTTP Apache.\nSi mod_proxy_ajp se conecta a un servidor AJP malicioso, este servidor AJP puede enviar un mensaje AJP malicioso de vuelta a mod_proxy_ajp y hacer que escriba 4 bytes controlados por el atacante despu\u00e9s del final de un b\u00fafer basado en mont\u00edculo.\n\nEste problema afecta al Servidor HTTP Apache: hasta 2.4.66.\n\nSe recomienda a los usuarios actualizar a la versi\u00f3n 2.4.67, que corrige el problema."}], "lastModified": "2026-09-14T13:17:54.970", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8FF781BA-CF81-400B-A155-4DAE0BD856EE", "versionEndExcluding": "2.4.67"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}