Vulnerability Monitor

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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.

Published

2025-06-07T08:15:20.687

Last Modified

2025-07-30T19:41:33.457

Status

Analyzed

Source

2499f714-1537-4658-8207-48ae4bb9eae9

Severity

CVSSv3.1: 7.5 (HIGH)

Weaknesses

Type: Primary
CWE-835

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	haxx	curl	< 8.14.1	Yes

References

https://curl.se/docs/CVE-2025-5399.html Vendor Advisory (2499f714-1537-4658-8207-48ae4bb9eae9)
https://curl.se/docs/CVE-2025-5399.json Vendor Advisory (2499f714-1537-4658-8207-48ae4bb9eae9)
https://hackerone.com/reports/3168039 Exploit, Issue Tracking, Third Party Advisory (2499f714-1537-4658-8207-48ae4bb9eae9)
http://www.openwall.com/lists/oss-security/2025/06/04/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)