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CVE-2026-11564

critical CVSS 9.1 EPSS 0.4%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-11564 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.20.1

At a glance

Severity
Critical
CVSS base score
9.1 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 35% of scored vulnerabilities
Weakness
CWE-295
Published
2026-07-03
NVD CVE.org

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