Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M
CVE-2026-47729Squid: Memory disclosure in FTP gateway
Medium 6.5
In plain English
A medium-severity out-of-bounds read in squid from squid-cache. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | squid | 7.6-r0 | ALPINE-CVE-2026-47729 |
| Alpine:v3.24 | squid | 7.6-r0 | ALPINE-CVE-2026-47729 |
| Debian:12 | squid | 5.7-2+deb12u6 | DEBIAN-CVE-2026-47729 |
| Debian:13 | squid | 6.13-2+deb13u2 | DEBIAN-CVE-2026-47729 |
| Debian:14 | squid | 7.6-1 | DEBIAN-CVE-2026-47729 |
| Ubuntu:22.04:LTS | squid | 5.9-0ubuntu0.22.04.8 | USN-8941-1 |
| Ubuntu:22.04:LTS | squid | 5.9-0ubuntu0.22.04.7 | UBUNTU-CVE-2026-47729 |
| Ubuntu:24.04:LTS | squid | 6.14-0ubuntu0.24.04.4 | UBUNTU-CVE-2026-47729 |
| Ubuntu:24.04:LTS | squid | 6.14-0ubuntu0.24.04.5 | USN-8941-1 |
| Ubuntu:25.10 | squid | 6.14-0ubuntu0.25.10.4 | UBUNTU-CVE-2026-47729 |
| Ubuntu:26.04:LTS | squid | 7.2-2ubuntu2.2 | UBUNTU-CVE-2026-47729 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| squid-cache | squid | < 7.6 |
Weakness: CWE-125, CWE-1289 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/squid-cache/squid/security/advisories/GHSA-8c37-pxjq-qwrg x_refsource_CONFIRM
- https://github.com/squid-cache/squid/pull/2408 x_refsource_MISC
- https://github.com/squid-cache/squid/pull/2409 x_refsource_MISC
- https://github.com/squid-cache/squid/commit/865a131c7d557e68c965043d98c2eccae26deef8 x_refsource_MISC
- https://github.com/squid-cache/squid/releases/tag/SQUID_7_6 x_refsource_MISC