Improper Enforcement of Behavioral Workflow Affecting squid package, versions <7:6.13-1.amzn2023.0.6


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
4.68% (92nd percentile)

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  • Snyk IDSNYK-AMZN2023-SQUID-20249259
  • published29 Sept 2026
  • disclosed13 Oct 2026

Introduced: 29 Sep 2026

NewCVE-2026-61642  (opens in a new tab)
CWE-841  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 squid to version 7:6.13-1.amzn2023.0.6 or higher.
This issue was patched in ALAS2023-2026-3145.

NVD Description

Note: Versions mentioned in the description apply only to the upstream squid package and not the squid package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (src/HttpHeader.cc) accepted the bare Transfer-Encoding: identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.

CVSS Base Scores

version 3.1