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CVE-2025-5399

Good to know:

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Date: June 7, 2025

WebSocket endless loop. 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.

Severity Score

Related Resources (8)

https://nvd.nist.gov/vuln/detail/CVE-2025-5399
https://hackerone.com/reports/3168039
http://www.openwall.com/lists/oss-security/2025/06/04/2
https://curl.se/docs/CVE-2025-5399.json
https://security.alpinelinux.org/vuln/CVE-2025-5399
https://security-tracker.debian.org/tracker/CVE-2025-5399
https://curl.se/docs/CVE-2025-5399.html
https://www.mend.io/vulnerability-database/CVE-2025-5399

Severity Score

Weakness Type (CWE)

Loop with Unreachable Exit Condition ('Infinite Loop')

CWE-835

Top Fix

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Upgrade to version https://github.com/curl/curl.git - curl-8_14_1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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