CVE-2025-5399

HIGH

curl 8.13.0-8.14.1 - Denial of Service via WebSocket Packet Processing

Title source: llm
STIX 2.1

Description

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.

References (4)

Core 4
Core References
Exploit, Issue Tracking, Third Party Advisory
https://hackerone.com/reports/3168039
Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2025/06/04/2

Scores

CVSS v3 7.5
EPSS 0.0123
EPSS Percentile 64.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-835
Status published
Products (1)
haxx/curl 8.13.0 - 8.14.1
Published Jun 07, 2025
Tracked Since Feb 18, 2026