CVE-2026-50012

MEDIUM 5.5

Squid: Memory corruption in cache_digest reply handling

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-20 CWE-122
Vendor	squid-cache
Product	squid
Published	Jul 16, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

squid-cache / squid

< 7.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: 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: https://github.com/squid-cache/squid/releases/tag/SQUID_7_6