[UPDATE] [high] cURL: Multiple vulnerabilities

highCVE-2026-4873 CVE-2026-5545 CVE-2026-5773 CVE-2026-6276 CVE-2026-6253 CVE-2026-6429

An attacker can exploit multiple vulnerabilities in cURL to bypass security measures, disclose confidential information, or manipulate data.

CSIRTS triage

vendor: cURL product: cURL Authentication bypass Information disclosureOther

What: Multiple vulnerabilities allow bypassing security measures, disclosing confidential information, or manipulating data.
Who is affected: Attackers can exploit these vulnerabilities in cURL.
Urgency: Remediation is high urgency due to the severity of potential impacts.
Action: Update to the latest version of cURL to mitigate the vulnerabilities.

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: 2026-09-01
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-2026-1307

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-2026-48730.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-55450.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-57730.62% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 47% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-62760.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-62530.72% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-64290.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-70090.27% 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-2026-71680.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-4873	coverage & exploitation status	NVD · CVE.org
CVE-2026-5545	coverage & exploitation status	NVD · CVE.org
CVE-2026-5773	coverage & exploitation status	NVD · CVE.org
CVE-2026-6276	coverage & exploitation status	NVD · CVE.org
CVE-2026-6253	coverage & exploitation status	NVD · CVE.org
CVE-2026-6429	coverage & exploitation status	NVD · CVE.org
CVE-2026-7009	coverage & exploitation status	NVD · CVE.org
CVE-2026-7168	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMultiples vulnérabilités dans les produits VMware (07 septembre 2026)cert-fr-avis
high[NEW] [high] Hitachi Energy RTU500: Multiple Vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Splunk products (20 August 2026)cert-fr-avis
unknownMultiple vulnerabilities in Tenable Security Center (August 14, 2026)cert-fr-avis
unknownUSN-8525-1: curl vulnerabilitiesubuntu
unknownMultiple vulnerabilities in Tenable Identity Exposure (June 24, 2026)cert-fr-avis
unknownMultiple vulnerabilities in cURL and libcurl (June 24, 2026)cert-fr-avis

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.

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