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)
Scores
CVSS v3
7.5
EPSS
0.0049
EPSS Percentile
65.4%
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