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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0337
Information Disclosure Vulnerability in Squid Proxy

Original Issue Date:June 24, 2026

Severity Rating: HIGH

Software Affected

  • Squid versions older than 3.5.28
  • All Squid 4.x versions
  • All Squid 5.x versions
  • All Squid 6.x versions
  • All Squid 7.x versions up to and including 7.5

Overview

A vulnerability has been reported in Squid Proxy which could allow a trusted client to disclose sensitive information from unrelated transactions processed by the affected proxy.

Target Audience:
All organizations and individuals using affected versions of Squid Proxy.

Risk Assessment:
High risk of sensitive information disclosure and unauthorized access to user data.

Impact Assessment:
Potential for disclosure of sensitive information, including authentication credentials, session tokens and other HTTP request data.

Description

Squid Proxy is a widely used open-source web proxy and caching server that supports protocols such as HTTP, HTTPS and FTP to improve network performance and reduce bandwidth usage.

This vulnerability has been reported in Squid Proxy due to improper validation of syntactic correctness of input, resulting in an out-of-bounds read vulnerability in the FTP gateway feature. A trusted client could exploit this vulnerability by accessing a specially crafted or misbehaving FTP server through Squids FTP gateway.

Successful exploitation of this vulnerability could allow an attacker to disclose sensitive information from unrelated transactions processed by the affected proxy.

Solution

Apply appropriate updates as mentioned as mentioned by the Vendor:
https://github.com/squid-cache/squid/security/advisories/GHSA-8c37-pxjq-qwrg

Vendor Information

Squid Proxy
http://www.squid-cache.org/Advisories/

References

 
https://github.com/squid-cache/squid/security/advisories/GHSA-8c37-pxjq-qwrg

CVE Name
CVE-2026-47729

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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