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CVE-2026-28780

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

Published: May 5, 2026Updated: May 6, 2026 Sources: CVE List NVD BDUCWE-122
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.7%
Top 53.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
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

Affected Products

Альт 8 СПАО «ИВК»
On-premOS
Operating Systems / linux-distro
АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
HTTP ServerApache Software Foundation
On-premWeb App
Networking Infrastructure / load-balancer-proxy
Apache HTTP ServerApache Software Foundation
On-premWeb App
Networking Infrastructure / load-balancer-proxy
http serverapache
On-premWeb App
Networking Infrastructure / load-balancer-proxy
ао «ивк»commercialRUOperating Systemsaka ivk
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation
apacheoss-projectUSWeb & CMS Pluginsaka apache http server, apache httpd

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

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

Timeline

Published
May 5, 2026
Last Updated
May 6, 2026

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