CVE-2026-56154

Apache Http Server: use-after-free

Risk score: 83/100
CVSS: 9.8 v3.1
Exploit chance (30 days): 0.6%
Published: 1 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is: Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...}) This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.
Affected: Apache Http Server
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Red

CVSS 9.8 critical
Remotely exploitable without logging in
On your watchlist: apache http server

References

https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2026/10/01/17

Original description

Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...}) This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Last activity 1 Oct 2026. Patch Forecast updates every hour.