Out-of-bounds write in Apache HTTP Server - CVE-2026-56153
Published: October 1, 2026
Vulnerability identifier: #VU153098
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56153
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to write beyond allocated memory.
The vulnerability exists due to an out-of-bounds write in mod_charset_lite's finish_partial_char function when processing crafted input. A remote attacker can provide crafted input to write beyond allocated memory.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-56153
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.69