CVE-2022-41318

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-25 · updated 2026-06-17
Weakness: CWE-190

Description

A buffer over-read was discovered in libntlmauth in Squid 2.5 through 5.6. Due to incorrect integer-overflow protection, the SSPI and SMB authentication helpers are vulnerable to reading unintended memory locations. In some configurations, cleartext credentials from these locations are sent to a client. This is fixed in 5.7.

Affected products

Squid: from 2.5 before 5.7 — fixed in 5.7

How to fix

Upgrade to a fixed version: Squid 5.7. Check the vendor advisory for mitigations.

References

http://www.squid-cache.org/Versions/v4/changesets/SQUID-2022_2.patch
http://www.squid-cache.org/Versions/v5/changesets/SQUID-2022_2.patch
https://github.com/squid-cache/squid/security/advisories/GHSA-394c-rr7q-6g78
https://www.openwall.com/lists/oss-security/2022/09/23/2
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2022_2.patch
http://www.squid-cache.org/Versions/v5/changesets/SQUID-2022_2.patch
https://github.com/squid-cache/squid/security/advisories/GHSA-394c-rr7q-6g78
https://www.openwall.com/lists/oss-security/2022/09/23/2

Get alerted when CVE-2022-41318 or the next vulnerability affects your stack