CVE-2026-61642

7.7High

Published 13 Oct 2026 · NVD status: Awaiting Analysis

7.7High

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: High impact on integrity
Weakness: CWE-444

The AI triage for this one isn't ready yet. Check back in a few minutes; the full NVD record is below in the meantime.

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Ad · In-content banner

NVD description

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.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-61642