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Information Disclosure Vulnerability in Squid Proxy

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

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

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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