HTTP Request Smuggling Affecting trafficserver package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-TRAFFICSERVER-21429705
- published22 Oct 2026
- disclosed21 Oct 2026
Introduced: 21 Oct 2026
NewCVE-2025-55702 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest trafficserver.
NVD Description
Note: Versions mentioned in the description apply only to the upstream trafficserver package and not the trafficserver package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.
Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.