CVE-2026-34356 is a vulnerability in Apache HTTP Server
Published on June 8, 2026
Apache HTTP Server: ProxyPassReverseCookieMap buffer overflow
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie*
This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
Users are recommended to upgrade to version 2.4.68, which fixes the issue.
Timeline
reported
fixed in 2.4.x by r1935008 102 days later.
2.4.68 released 3 days later.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-34356
Want to know whenever a new CVE is published for Apache HTTP Server? stack.watch will email you.
Affected Versions
Apache Software Foundation Apache HTTP Server:- Version 2.4.0, <= 2.4.67 is affected.