CVE-2026-11586 Affecting curl package, versions <8.21.0-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE324-CURL-17716543
- published30 Jun 2026
- disclosed3 Jul 2026
Introduced: 30 Jun 2026
NewCVE-2026-11586 (opens in a new tab)How to fix?
Upgrade Alpine:3.24 curl to version 8.21.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Alpine.
See How to fix? for Alpine:3.24 relevant fixed versions and status.
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.