Is CVE-2026-11586 in the CISA KEV catalog?

No. CVE-2026-11586 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2026-11586?

CVE-2026-11586 has an EPSS score of 0.21% (11th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-11586?

Upgrade curl on debian unstable to 8.21.0~rc3-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-11586

UNSCORED

NVD

Description

By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages.

How to fix

Remediation Available

curlDebian

Fixed in:8.21.0~rc3-1CVE-2026-11586

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

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% 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.