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CVE-2026-50012

Squid: Memory corruption in cache_digest reply handling

Published: Jul 16, 2026Updated: Jul 20, 2026 Sources: CVE List NVDCWE-20
5.5MEDIUM
NVD MITRE
EPSS Score
1.4%
Top 30.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:NI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High
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Weaknesses

CWE-20CWE-122

Affected Products

squid-cache
oss-projectaka squid, squid cache
squidOn-premNetwork Device
Networking Infrastructure / load-balancer-proxy

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284
github.com
https://github.com/squid-cache/squid/pull/2423
github.com
https://github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c003bcd
github.com
and 1 more references View all →
News mentions
2

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