CVE-2026-8932

HIGH 7.5

incomplete mTLS config matching in conn reuse

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-305
Vendor	curl
Product	curl
Published	Jul 3, 2026
Last Updated	Sep 15, 2026

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Affected Versions

curl / curl

7.7.0 < 8.14.2 8.15.0 < 8.16.1 8.17.0 < 8.20.1

curl / curl

a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 < 7541ae569d82fb308a5e2d94916027da4fa3ba3e

curl / curl

8.20.0 8.19.0 8.18.0 8.17.0 8.16.0 8.15.0 8.14.1 8.14.0 8.13.0 8.12.1 8.12.0 8.11.1 8.11.0 8.10.1 8.10.0 8.9.1 8.9.0 8.8.0 8.7.1 8.7.0 8.6.0 8.5.0 8.4.0 8.3.0 8.2.1 8.2.0 8.1.2 8.1.1 8.1.0 8.0.1 8.0.0 7.88.1 7.88.0 7.87.0 7.86.0 7.85.0 7.84.0 7.83.1 7.83.0 7.82.0 7.81.0 7.80.0 7.79.1 7.79.0 7.78.0 7.77.0 7.76.1 7.76.0 7.75.0 7.74.0 7.73.0 7.72.0 7.71.1 7.71.0 7.70.0 7.69.1 7.69.0 7.68.0 7.67.0 7.66.0 7.65.3 7.65.2 7.65.1 7.65.0 7.64.1 7.64.0 7.63.0 7.62.0 7.61.1 7.61.0 7.60.0 7.59.0 7.58.0 7.57.0 7.56.1 7.56.0 7.55.1 7.55.0 7.54.1 7.54.0 7.53.1 7.53.0 7.52.1 7.52.0 7.51.0 7.50.3 7.50.2 7.50.1 7.50.0 7.49.1 7.49.0 7.48.0 7.47.1 7.47.0 7.46.0 7.45.0 7.44.0 7.43.0 7.42.1 7.42.0 7.41.0 7.40.0 7.39.0 7.38.0 7.37.1 7.37.0 7.36.0 7.35.0 7.34.0 7.33.0 7.32.0 7.31.0 7.30.0 7.29.0 7.28.1 7.28.0 7.27.0 7.26.0 7.25.0 7.24.0 7.23.1 7.23.0 7.22.0 7.21.7 7.21.6 7.21.5 7.21.4 7.21.3 7.21.2 7.21.1 7.21.0 7.20.1 7.20.0 7.19.7 7.19.6 7.19.5 7.19.4 7.19.3 7.19.2 7.19.1 7.19.0 7.18.2 7.18.1 7.18.0 7.17.1 7.17.0 7.16.4 7.16.3 7.16.2 7.16.1 7.16.0 7.15.5 7.15.4 7.15.3 7.15.2 7.15.1 7.15.0 7.14.1 7.14.0 7.13.2 7.13.1 7.13.0 7.12.3 7.12.2 7.12.1 7.12.0 7.11.2 7.11.1 7.11.0 7.10.8 7.10.7 7.10.6 7.10.5 7.10.4 7.10.3 7.10.2 7.10.1 7.10 7.9.8 7.9.7 7.9.6 7.9.5 7.9.4 7.9.3 7.9.2 7.9.1 7.9 7.8.1 7.8 7.7.3 7.7.2 7.7.1 7.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

curl.se: https://curl.se/docs/CVE-2026-8932.json curl.se: https://curl.se/docs/CVE-2026-8932.html hackerone.com: https://hackerone.com/reports/3733910

Credits

Joshua Rogers (Aisle Research) Joshua Rogers (Aisle Research)