CVE-2026-28780
CRITICALApache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
https://httpd.apache.org/security/vulnerabilities_24.html
Scores
CVSS v3
9.8
EPSS
0.0003
EPSS Percentile
7.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-122
Status
published
Products (2)
apache/http_server
< 2.4.67
Apache Software Foundation/Apache HTTP Server
< 2.4.66
Published
May 05, 2026
Tracked Since
May 06, 2026