Out-of-bounds read in Squid - CVE-2026-47729

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Main Vulnerability Database Vulnerabilities #VU135132

Out-of-bounds read in Squid - CVE-2026-47729

Published: June 24, 2026


Vulnerability identifier: #VU135132
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-47729
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to improper validation of syntactic correctness of input in the FTP gateway when accessing a misbehaving FTP server through the gateway feature. A remote user can access a misbehaving FTP server through the gateway feature to disclose sensitive information.

The issue can cause an out-of-bounds read from random unrelated transactions.


Affected software

Squid
Debian Linux
openEuler
Fedora
squid
squid-debuginfo
squid-debugsource
squid (Debian package)

How to mitigate CVE-2026-47729

Install security update from vendor's website.

Squid - update to 7.6
squid - update to 4.9-31
squid-debuginfo - update to 4.9-31
squid-debugsource - update to 4.9-31
squid (Debian package) - update to 6.13-2+deb13u2
squid - update to 7.6-1.fc44

External References

Related Security Bulletins