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 vu

mediumCVSS 5.5CVE-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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.5
Published: 2026-07-16
Last updated: 2026-07-20
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-50012

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Moderate exploitation riskCVE-2026-500121.4% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 69% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50012	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] Squid: Multiple vulnerabilitiescert-bund
mediumCVE-2026-50012: Squid: Memory corruption in cache_digest reply handlingmsrc
unknownMultiple vulnerabilities in Squid (June 23, 2026)cert-fr-avis
unknownDSA-6360-1 squid - security updatedebian

Recent advisories for Squid is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Squid: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-24
medium[UPDATE] [medium] Squid: Multiple vulnerabilitiescert-bund · 2026-07-24
mediumCVE-2026-47729: Squid is a caching proxy for the Web. Prior to 7.6, due to an improper validation of syntactic…nvd · 2026-07-16
mediumCVE-2026-50012: Squid: Memory corruption in cache_digest reply handlingmsrc · 2026-07-14
mediumCVE-2026-47729: Squid: Memory disclosure in FTP gatewaymsrc · 2026-07-14
unknownMultiple vulnerabilities in Squid (June 23, 2026)cert-fr-avis · 2026-06-23