UpHeron
All vulnerabilities

Servers and applications

CVE-2026-11586

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
High 7.5
Published
3 Jul 2026
Last changed
15 Sept 2026
Added to UpHeron
21 Oct 2026
Fixed in
8.21.0
Sources
NVD

Affected software

SoftwareAffected versions
curlServers and applications · cpe:a:haxx:curl
  • From 8.16.0 before 8.21.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-11586
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-11586