What’s Vulnerable › Vulnerabilities

CVE-2026-47729: Squid: Memory disclosure in FTP gateway

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-16 · updated 2026-10-24
• Weakness: CWE-125

Description

Squid is a caching proxy for the Web. Prior to 7.6, due to an improper validation of syntactic correctness of input in the FTP gateway (src/clients/FtpGateway.cc), Squid is vulnerable to an out-of-bounds read: when a listing entry date in the TypeA or TypeB directory-listing formats is not followed by a filename, parsing was not restricted to the input buffer, so a trusted client accessing a misbehaving FTP server through Squid's gateway feature could read memory from random unrelated transactions. This issue is fixed in version 7.6.

Affected products

• Squid: before 7.6 — fixed in 7.6

How to fix

Upgrade to a fixed version: Squid 7.6. Check the vendor advisory for mitigations.

References

• https://github.com/squid-cache/squid/commit/865a131c7d557e68c965043d98c2eccae26deef8
• https://github.com/squid-cache/squid/pull/2408
• https://github.com/squid-cache/squid/pull/2409
• https://github.com/squid-cache/squid/releases/tag/SQUID_7_6
• https://github.com/squid-cache/squid/security/advisories/GHSA-8c37-pxjq-qwrg

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