Quick answers
- Is CVE-2026-111808 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-111808 being exploited in the wild.
- How severe is CVE-2026-111808?
- High severity, with a CVSS score of 8.6, published 21 October 2026.
- Which products and versions are affected?
- Apache Traffic Server 8.0.0–8.1.11, 9.0.0–9.2.15, 10.0.0–10.1.4, 10.2.0.
- Is there a fix for CVE-2026-111808?
- 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-2026-111808 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-111808?
- 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
A malformed padded HTTP/2 DATA frame can trigger improper handling in Traffic Server's HTTP/2 to HTTP/1.1 protocol translation, causing the proxy to create excessive worker connections or requests against origin servers. The vulnerability is triggered via the network without authentication, affecting the availability of backend infrastructure.
Affected products
- Apache Traffic Server 8.0.0–8.1.11, 9.0.0–9.2.15, 10.0.0–10.1.4, 10.2.0
Timeline
- 2026-10-21: disclosed