CVE-2026-11564

CRITICAL 9.1

Native CA trust persist

CVSS Score

9.1

EPSS Score

0.2%

EPSS Percentile

9th

libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.

Vendor	curl
Product	curl
Published	Jul 3, 2026
Last Updated	Jul 6, 2026

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Affected Versions

curl / curl

8.20.0 ≤ 8.20.0 8.19.0 ≤ 8.19.0 8.18.0 ≤ 8.18.0 8.17.0 ≤ 8.17.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

curl.se: https://curl.se/docs/CVE-2026-11564.json curl.se: https://curl.se/docs/CVE-2026-11564.html hackerone.com: https://hackerone.com/reports/3788984

Credits

Filipe Casal of Trail of Bits in collaboration with OpenAI Stefan Eissing