CVE-2026-11586
7.5
HIGH
CVSS 3.1
EPSS 0.86%
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 CVE-2026-11586
To remediate CVE-2026-11586, upgrade the affected package to a fixed version below.
- Alpine/curl—upgrade to 8.21.0-r0 or later
Is CVE-2026-11586 being exploited?
Low — EPSS is 0.9%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 8.16.0, < 8.21.0-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |