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CVE-2026-8932

HighPublished

incomplete mTLS config matching in conn reuse

Published: Jul 3, 2026
Updated: Sep 15, 2026
Assigning CNA: curl
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 33.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, some TLS settings related to client certificates were left out from the configuration match checks, making them match too easily. In particular options related to the private key.

Sources

CVE-2026-8932Informational
CVE-2026-8932
CVE-2026-8932-PoCPoC
Proof-of-concept reproducing CVE-2026-8932, an incomplete mTLS configuration matching flaw in libcurl connection reuse, with a local lab server and C PoC.

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