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Servers and applications

CVE-2025-5399

Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop. There is no other way for the application to escape or exit this loop other than killing the thread/process. This might be used to DoS libcurl-using application.

Severity
High 7.5
Published
7 Jun 2025
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
8.14.1
Sources
NVD

Affected software

SoftwareAffected versions
curlServers and applications · cpe:a:haxx:curl
  • From 8.13.0 before 8.14.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-5399
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-5399