CVE-2026-47729: Squid: Memory disclosure in FTP gateway

mediumpublic exploitCVSS 6.5CVE-2026-47729

CSIRTS triage

vendor: Squid product: Squid Information disclosure

What: There is a memory disclosure vulnerability in the FTP gateway of Squid.
Who is affected: Deployments of Squid that utilize the FTP gateway feature.
Urgency: Remediation is necessary due to the medium severity and potential for sensitive information exposure.
Action: Update to the latest version of Squid that fixes this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47729

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-2026-477291.5% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 72% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-47729	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-2026-47729: Squid is a caching proxy for the Web. Prior to 7.6, due to an improper validation of syntactic…nvd
unknownMultiple vulnerabilities in Squid (June 23, 2026)cert-fr-avis
unknownDSA-6360-1 squid - security updatedebian

Recent advisories for Squid

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-2026-50012: Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in…nvd · 2026-07-16
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
unknownMultiple vulnerabilities in Squid (June 23, 2026)cert-fr-avis · 2026-06-23