#VU110191 Infinite loop in cURL - CVE-2025-5399

Vulnerability identifier: #VU110191

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-5399

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
cURL
Client/Desktop applications / Other client software

Vendor: curl.haxx.se

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop within the WebSocket code. A malicious web server can send a specially crafted packet to the libcurl application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

cURL: 8.13.0 - 8.14.0

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External links
https://curl.se/docs/CVE-2025-5399.html

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?