CVE-2026-11586

7.5 highEPSS 0.9%

High (7.5) in haxx curl. EPSS 0.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-31)
CWE: CWE-770
Published: 2026-07-03
Modified: 2026-09-15
Record from: the NVD, synced 2026-10-19

Affected

haxx:curl

References

https://curl.se/docs/CVE-2026-11586.html
https://curl.se/docs/CVE-2026-11586.json
https://hackerone.com/reports/3788931

Check your stack JSON