Squid: Memory corruption in cache_digest reply handling

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Summary

CVECVE-2026-50012
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 17:16:57 UTC
Updated2026-07-16 17:36:21 UTC
DescriptionSquid 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-20 | CWE-122 | CWE-20 CWE-20: Improper Input Validation | CWE-122 CWE-122: Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
3.1CNADECLARED5.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Squid-cache Squid affected < 7.6 Not specified

References

ReferenceSourceLinkTags
github.com/squid-cache/squid/pull/2423 [email protected] github.com
github.com/squid-cache/squid/releases/tag/SQUID_7_6 [email protected] github.com
github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c00... [email protected] github.com
github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284 [email protected] github.com
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