Quick answers
- Is CVE-2026-111811 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-111811 being exploited in the wild.
- How severe is CVE-2026-111811?
- Critical severity, with a CVSS score of 9, published 21 October 2026.
- Which products and versions are affected?
- Apache Traffic Server 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, 10.2.0.
- Is there a fix for CVE-2026-111811?
- Yes: fixed in 9.2.16, 10.1.5, 10.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-111811 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-111811?
- Check whether you run Apache Traffic 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: 9.2.16, 10.1.5, 10.2.1
Technical details
The tsmemcache plugin in Apache Traffic Server lacks authentication controls on memcache protocol operations, allowing unauthenticated network-based read, write, and deletion of the shared proxy cache. This is a network-accessible vulnerability requiring no prior authentication or user interaction. An attacker can exfiltrate cached data, corrupt cache contents, or cause denial of service.
Affected products
- Apache Traffic Server 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, 10.2.0
Timeline
- 2026-10-21: disclosed