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MEDIUM

CVE-2026-50012

CVSS v3

5.5

MEDIUM

EPSS Score

2.3 %

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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-

Technical details

CVSS v3 Vector
3.1
Published
2026-07-16
Last Modified
2026-07-17

Frequently asked questions

What is 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-

Is CVE-2026-50012 actively exploited?

Active exploitation of CVE-2026-50012 has not been confirmed. The EPSS score is 2.3%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-50012?

CVE-2026-50012 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string 3.1.

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