Is CVE-2026-11564 in the CISA KEV catalog?

No. CVE-2026-11564 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2026-11564?

CVE-2026-11564 has an EPSS score of 0.20% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-11564?

Upgrade curl on debian unstable to 8.21.0~rc2-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-11564

UNSCORED

NVD

Description

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.

How to fix

Remediation Available

curlDebian

Fixed in:8.21.0~rc2-1CVE-2026-11564

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

0.20%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-03.