[UPDATE] [medium] cURL: Multiple vulnerabilities

CSIRTS triage

What

An attacker can exploit multiple vulnerabilities in cURL to bypass security measures, disclose confidential information, manipulate data, or cause a Denial-of-Service condition.

Who is affected

Deployments of cURL are affected.

Urgency

Remediation is medium urgency as the vulnerabilities can lead to various security issues but are not currently exploited.

Action

Update to the latest version of cURL.

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

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-2026-2065

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-2026-82860.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-84580.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-89240.56% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-89250.59% 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-2026-89260.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-89270.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-89320.40% 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-2026-90790.58% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 45% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownUSN-8670-2: curl vulnerabilityubuntu
• unknownUSN-8670-1: curl vulnerabilityubuntu
• unknownMultiple vulnerabilities in IBM products (July 31, 2026)cert-fr-avis
• unknownMultiple vulnerabilities in Microsoft Azure Linux (July 15, 2026)cert-fr-avis
• mediumCVE-2026-8458: wrong reuse for different servicesmsrc
• highCVE-2026-8932: incomplete mTLS config matching in conn reusemsrc
• mediumCVE-2026-8927: env-set cross-proxy Digest auth state leakmsrc
• unknownCVE-2026-9079: stale proxy password leakmsrc
• criticalCVE-2026-8926: password leak with netrc and user in URLmsrc
• mediumCVE-2026-8925: SASL double-freemsrc
• highCVE-2026-8286: wrong STARTTLS connection reusemsrc
• criticalCVE-2026-8924: trailing dot domain super cookiemsrc

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