Squid vulnerable to information disclosure via authentication credential leakage in error handling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-62168
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-17 17:15:49 UTC
Updated2026-10-19 16:10:00 UTC
DescriptionSquid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication credentials in error handling allows information disclosure. The vulnerability allows a script to bypass browser security protections and learn the credentials a trusted client uses to authenticate. This potentially allows a remote client to identify security tokens or credentials used internally by a web application using Squid for backend load balancing. These attacks do not require Squid to be configured with HTTP authentication. The vulnerability is fixed in version 7.2. As a workaround, disable debug information in administrator mailto links generated by Squid by configuring squid.conf with email_err_data off.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.633600000 probability, percentile 0.992040000 (date 2026-10-19)

Problem Types: CWE-209 | CWE-550 | CWE-209 CWE-209: Generation of Error Message Containing Sensitive Information | CWE-550 CWE-550: Server-generated Error Message Containing Sensitive Information

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1[email protected]Secondary10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Squid-cache Squid All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Squid-cache Squid affected < 7.2 Not specified

References

ReferenceSourceLinkTags
github.com/squid-cache/squid/security/advisories/GHSA-c8cc-phh7-xmxr [email protected] github.com Mitigation, Third Party Advisory
www.openwall.com/lists/oss-security/2025/11/05/6 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/squid-cache/squid/commit/0951a0681011dfca3d78c84fd7f1e19c78a4... [email protected] github.com Patch
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