Denial of Service in libcurl's WebSocket Implementation
CVE-2025-5399

7.5HIGH

Key Information:

Vendor

Curl

Status
Curl
Vendor
CVE Published:
7 June 2025

What is CVE-2025-5399?

A vulnerability in libcurl's WebSocket handling allows a remote server to deliver a specially crafted packet, which can cause applications utilizing libcurl to enter an infinite busy-loop. This condition prevents the application from terminating or recovering without forcibly terminating the process. Such an occurrence may be exploited to launch Denial of Service attacks against libcurl-dependent applications.

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Affected Version(s)

curl 8.14.0

curl 8.13.0

References

https://curl.se/docs/CVE-2025-5399.json
https://curl.se/docs/CVE-2025-5399.html
https://hackerone.com/reports/3168039

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

z2_ on hackerone
z2_ on hackerone
JSON
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