CVE-2025-5399
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductHaxx Curl
PublishedJun 7, 2025
First seenJun 7, 2025
Weakness typeCWE-835CWE-835
How to fix
Update
- haxx curl8.14.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| haxx curl | 8.13.0 ≤ v < 8.14.1 | 8.14.1 |
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