[UPDATE] [medium] cURL: Multiple vulnerabilities

mediumCVE-2026-10536 CVE-2026-11352 CVE-2026-11564 CVE-2026-11586 CVE-2026-11856 CVE-2026-12064

An attacker can exploit multiple vulnerabilities in cURL to bypass security measures, disclose confidential information, or cause a denial-of-service condition or memory corruption.

CSIRTS triage

vendor: cURL product: cURL Authentication bypass Information disclosure Denial of service Memory corruption

What: Multiple vulnerabilities allow an attacker to bypass security measures, disclose information, or cause denial-of-service or memory corruption.
Who is affected: Deployments of cURL are affected.
Urgency: Remediation is important to prevent potential exploitation of these vulnerabilities.
Action: Update cURL to the latest version.

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: medium
Published: 2026-08-25
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-2026-2052

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.

Low exploitation riskCVE-2026-105360.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-113520.58% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 45% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-115640.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-115860.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-118560.60% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-120640.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-90800.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-95450.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-95460.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-95470.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-10536	coverage & exploitation status	NVD · CVE.org
CVE-2026-11352	coverage & exploitation status	NVD · CVE.org
CVE-2026-11564	coverage & exploitation status	NVD · CVE.org
CVE-2026-11586	coverage & exploitation status	NVD · CVE.org
CVE-2026-11856	coverage & exploitation status	NVD · CVE.org
CVE-2026-12064	coverage & exploitation status	NVD · CVE.org
CVE-2026-9080	coverage & exploitation status	NVD · CVE.org
CVE-2026-9545	coverage & exploitation status	NVD · CVE.org
CVE-2026-9546	coverage & exploitation status	NVD · CVE.org
CVE-2026-9547	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownUSN-8651-1: curl vulnerabilityubuntu
unknownMultiple vulnerabilities in Tenable Security Center (August 14, 2026)cert-fr-avis
unknownMultiple vulnerabilities in Microsoft Azure Linux (July 15, 2026)cert-fr-avis
highCVE-2026-12064: proto-default skips SSH verificationmsrc
mediumCVE-2026-10536: HTTP/2 stream-dependency tree UAFmsrc
highCVE-2026-9545: exposing HTTP/3 early datamsrc
mediumCVE-2026-11856: cross-origin Digest auth state leakmsrc
criticalCVE-2026-9547: SSH improper host validationmsrc
lowCVE-2026-9080: UAF after pause in socket callbackmsrc
unknownUSN-8525-1: curl vulnerabilitiesubuntu
highCVE-2026-9547: When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the …nvd
highCVE-2026-9546: A vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly cl…nvd

Recent advisories for cURL

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.

unknownUSN-8670-2: curl vulnerabilityubuntu · 2026-08-25
medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund · 2026-08-25
unknownUSN-8670-1: curl vulnerabilityubuntu · 2026-08-24
high[UPDATE] [high] cURL: Multiple vulnerabilitiescert-bund · 2026-08-20
unknownUSN-8651-1: curl vulnerabilityubuntu · 2026-08-19
medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund · 2026-08-19