Quick answers
- Is CVE-2026-118514 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118514 being exploited in the wild.
- How severe is CVE-2026-118514?
- Informational severity, published 6 November 2026.
- Which products and versions are affected?
- Symfony Http Foundation prior to 5.4.56, 6.4.50, 7.4.23, 8.1.11.
- Is there a fix for CVE-2026-118514?
- Yes: fixed in 5.4.56, 6.4.50, 7.4.23, 8.1.11. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118514 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-118514?
- Check whether you run Symfony Http Foundation 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: 5.4.56, 6.4.50, 7.4.23, 8.1.11
Technical details
The RequestMatcher and MethodRequestMatcher classes in Symfony\Component\HttpFoundation perform verbatim comparison of HTTP request methods against a configured list, without accounting for HTTP semantics where HEAD requests should be handled identically to GET requests. An attacker can bypass GET-only security rules by sending a HEAD request, which will match a different firewall rule or no firewall at all, allowing unauthorized controller execution and potential side effects while receiving response headers.
Affected products
- Symfony http-foundation prior to 5.4.56, 6.4.50, 7.4.23, 8.1.11
Timeline
- 2026-11-06: disclosed