HTTP Request Smuggling Affecting squid package, versions [3.3.0.1, 7.6)
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-UNMANAGED-SQUID-20936868
- published14 Oct 2026
- disclosed13 Oct 2026
- creditMitchell Benjamin
Introduced: 13 Oct 2026
NewCVE-2026-61642 (opens in a new tab)How to fix?
Upgrade squid to version 7.6 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling via improper handling of the Transfer-Encoding: identity header in HttpHeader::parse in src/HttpHeader.cc. Squid incorrectly accepted the bare Transfer-Encoding: identity form, which is explicitly prohibited by the HTTP specification, instead of rejecting it. An authenticated remote attacker can exploit this to smuggle HTTP requests through Squid, bypassing security controls and potentially poisoning the cache or accessing backend resources with elevated privilege.