Quick answers
- Is CVE-2026-56154 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-56154 being exploited in the wild.
- How severe is CVE-2026-56154?
- Critical severity, with a CVSS score of 9.8, published 1 October 2026.
- Which products and versions are affected?
- Apache HTTP Server 2.4.0 through 2.4.68.
- Is there a fix for CVE-2026-56154?
- Yes: fixed in Apache HTTP Server 2.4.69. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-56154 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-56154?
- Check whether you run Apache HTTP Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Apache HTTP Server 2.4.69
Technical details
A use-after-free vulnerability exists in Apache HTTP Server's mod_rewrite module when handling lookahead expansion (%{LA-U:HTTP:...}). The vulnerability can be triggered by crafted HTTP requests to servers with mod_rewrite enabled and lookahead rules configured. Exploitation requires network access and no authentication; a fix is available in version 2.4.69.
Affected products
- Apache HTTP Server 2.4.0 through 2.4.68
Timeline
- 2026-05-25: disclosed
- 2026-10-01: patched: Fixed in 2.4.x by r1938660
- 2026-10-01: advisory: 2.4.69 released