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curl

A vulnerability in libcurl causes it to reuse previously created connections even when certain mutual TLS (mTLS) configuration options related to client certificates have changed, which should prevent reuse. This flaw can lead to the wrong client certificates being used during TLS connections. The issue affects multiple versions of curl, including various Ubuntu package versions. Fixes have been released and are available through standard system updates or Ubuntu Pro for extended support releases.

libcurl maintains a connection pool to reuse existing connections for subsequent transfers if the setup matches. However, some TLS settings related to client certificates, particularly options involving the private key, were not included in the configuration match checks. This omission caused libcurl to reuse connections even when mTLS-related options changed, potentially resulting in the use of incorrect client certificates. The vulnerability is identified as CVE-2026-8932 and affects numerous curl versions, including those packaged in Ubuntu releases. The issue has been addressed in updated package versions provided by Ubuntu.

Detailed information about GHSA-m7xm-hf59-w6rj. Get real-time updates, technical details, and mitigation strategies.

GHSA-m7xm-hf59-w6rj - Live Threat Intelligence - Threat Radar | OffSeq.com

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

Microsoft Support Lifecycle

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libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. (CVE-2026-8932)

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