CVE-2026-28780

Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()

Published: May 5, 2026Updated: Sep 14, 2026 Sources: CVE List NVD BDUCWE-122

9.8CRITICAL

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-122 CWE-787

Affected Products

АО «ИВК»

commercial·RUaka ivk

АЛЬТ СП 10On-premOS

Operating Systems / linux-distro

Apache Software Foundation

oss-project·USaka apache foundation

Apache HTTP ServerOn-premWeb App

Networking Infrastructure / load-balancer-proxy

apache

oss-project·USaka apache httpd, apache http server

http serverOn-premWeb App

Networking Infrastructure / load-balancer-proxy

and 2 more affected products View all →

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

Privilege Escalation

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References

https://httpd.apache.org/security/vulnerabilities_24.html

httpd.apache.org

https://altsp.su/obnovleniya-bezopasnosti/

altsp.su

http://www.openwall.com/lists/oss-security/2026/05/05/9

openwall.com

and 15 more references View all →

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