SB2026062453 - Multiple vulnerabilities in Squid

Description

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2026-47729)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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/E:U/U:Clear

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.

2) Heap-based buffer overflow (CVE-ID: CVE-2026-50012)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to cause a denial of service and modify memory.

The vulnerability exists due to heap-based buffer overflow in cache_digest reply handling when processing maliciously crafted replies to cache_digest request messages. A remote privileged user can send a specially crafted reply to cause a denial of service and modify memory.

Only instances compiled with the --enable-cache-digests option are vulnerable, and exploitation requires a trusted peer relationship over TCP.

Remediation

Install update from vendor's website.

References

• https://github.com/squid-cache/squid/security/advisories/GHSA-8c37-pxjq-qwrg
• https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284