Vulnerability Report

CVE-2026-50012

Title: Heap-based buffer overflow in Squid cache digest

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2026-50012.

CWE Category CWE-20
Published Date Jul 16, 2026
Modified Date Jul 20, 2026
Exploit Status Not Found
Score 5.5 CVSS v3.1
Exploit Probability (EPSS)
1.36%

Vulnerability Summary

CVE-2026-50012: 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.

Impacted Vendors

S
squid 1
S
squid-cache 1

Reference Links

https://github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c003bcd https://github.com/squid-cache/squid/pull/2423 https://github.com/squid-cache/squid/releases/tag/SQUID_7_6 https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
5.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
5.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-50012 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

Affected Stack

No specific products linked.