Quick answers
- Is CVE-2026-11710 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-11710 being exploited in the wild.
- How severe is CVE-2026-11710?
- Medium severity, with a CVSS score of 6.5, published 18 September 2026.
- Which products and versions are affected?
- IBM WebSphere Application Server 8.5.0.0 through 8.5.5.30.
- Is there a fix for CVE-2026-11710?
- A patch was published on 2026-09: Fix Pack 8.5.5.31 availability expected September 2026 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-11710 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-11710?
- Check whether you run IBM WebSphere Application 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.
Technical details
The vulnerability stems from inconsistent interpretation of HTTP requests (CWE-444) caused by improper Content-Length header handling in the HTTP request parsing logic. An unauthenticated network attacker with no user interaction required can craft malformed requests to desynchronize the HTTP layer, allowing request smuggling attacks. A fix is available in Fix Pack 8.5.5.31 or later.
Affected products
- IBM WebSphere Application Server 8.5.0.0 through 8.5.5.30
Timeline
- 2026-09-08: disclosed
- 2026-09: patched: Fix Pack 8.5.5.31 availability expected September 2026