[UPDATE] [high] Squid: Multiple vulnerabilities allow denial of service

highCVE-2026-32748 CVE-2026-33515 CVE-2026-33526

A remote, anonymous attacker can exploit multiple vulnerabilities in Squid to conduct a denial of service attack.

CSIRTS triage

vendor: Squid product: Squid Denial of serviceOther

What: Multiple vulnerabilities in Squid allow a remote anonymous attacker to conduct a denial of service attack.
Who is affected: Deployments of Squid are affected by these vulnerabilities.
Urgency: Remediation is urgent due to the high severity of the vulnerabilities and potential for exploitation.
Action: Apply the latest patches for Squid.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-07-24
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0854

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-2026-327488.9% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 95% of all scored CVEs.
Moderate exploitation riskCVE-2026-335151.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all scored CVEs.
Moderate exploitation riskCVE-2026-335268.9% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 95% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-32748	coverage & exploitation status	NVD · CVE.org
CVE-2026-33515	coverage & exploitation status	NVD · CVE.org
CVE-2026-33526	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

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.

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
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