CVE-2026-8932: incomplete mTLS config matching in conn reuse

CSIRTS triage

What

Incomplete mTLS config matching in connection reuse could lead to security issues.

Who is affected

Deployments using mTLS configurations are affected.

Urgency

Remediation is urgent due to the high severity of the vulnerability (CVSS 7.5).

Action

Review and correct mTLS configurations to ensure proper matching.

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

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

high — CVSS 7.5

Published

2026-07-02

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8932

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-2026-89320.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• medium[UPDATE] [medium] cURL: Multiple vulnerabilitiescert-bund
• highCVE-2026-8932: libcurl would reuse a previously created connection even when some mTLS config related option h…nvd
• unknownMultiple vulnerabilities in cURL and libcurl (June 24, 2026)cert-fr-avis

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