Bug 2492883 (CVE-2026-50012)

Summary:	CVE-2026-50012 squid: memory corruption in cache_digest reply handling
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in Squid. Due to improper input validation, a heap-based buffer overflow can occur when processing cache digests. This issue allows a trusted server to cause a denial of service when sending specially crafted replies to cache_digest request messages.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2492995, 2492996
Bug Blocks:

Description OSIDB Bzimport 2026-06-25 13:15:07 UTC

Due to an improper input validation bug, Squid is vulnerable to a heap-based buffer overflow attack against cache digests.

This problem allows a trusted server to perform a heap-based buffer overflow when sending maliciously crafted replies to cache_digest request messages.

This attack is limited to Squid instances that have been compiled with the --enable-cache-digests option. Trusted peers are expected to be servers within the same administrative domain. As cache digests are exchanged over TCP, there is no risk of spoofing.