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

What is CVE-2026-47729?

CVE-2026-47729 is a medium-severity vulnerability in Squid-Cache Squid, published on 16 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-1289, CWE-125

Which versions are affected by CVE-2026-47729?

It affects 1 product.

Products include Squid-Cache Squid.

How do I fix CVE-2026-47729?

Upgrade to a fixed version.

Is CVE-2026-47729 being exploited?

There is no known exploitation of CVE-2026-47729 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Squid-Cache Squid

• CVE-2025-62168 Squid vulnerable to information disclosure via authentication credential leakage in error handling Critical 10.0
• CVE-2025-54574 Squid's URN Handling can lead to Buffer Overflow Critical 9.3
• CVE-2026-33526 Squid vulnerable to Denial of Service in ICP Request handling Critical 9.2
• CVE-2026-32748 Squid has Denial of Service in ICP Response handling High 8.7
• CVE-2023-50269 SQUID-2023:10 Denial of Service in HTTP Request parsing High 8.6

All Squid-Cache Squid vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-47729, AZL-92444, DEBIAN-CVE-2026-47729, GHSA-8c37-pxjq-qwrg, MINI-qhpm-mghr-w2gv, UBUNTU-CVE-2026-47729.