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CVE-2025-5399— WebSocket endless loop

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libcurl是cURL开源的一个免费且易于使用的客户端 URL 传输库。 libcurl 8.13.0版本至8.14.0版本存在安全漏洞，该漏洞源于WebSocket代码错误处理不当，可能导致拒绝服务攻击。

AI Predicted 6.5 Difficulty: Easy EPSS 1.38% · P71
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I. Basic Information for CVE-2025-5399

Vulnerability Information
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Vulnerability Title
WebSocket endless loop
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
libcurl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcurl是cURL开源的一个免费且易于使用的客户端 URL 传输库。 libcurl 8.13.0版本至8.14.0版本存在安全漏洞，该漏洞源于WebSocket代码错误处理不当，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
curl curl 8.14.0 ~ 8.14.0 -

II. Public POCs for CVE-2025-5399

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III. Intelligence Information for CVE-2025-5399

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Vendor Advisories for CVE-2025-5399 (1)

Other References for CVE-2025-5399 (1)

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl

V. Comments for CVE-2025-5399

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