Bug 2370920 (CVE-2025-5399) - CVE-2025-5399 curl: libcurl: WebSocket endless loop
Summary: CVE-2025-5399 curl: libcurl: WebSocket endless loop
Keywords:
Status: NEW
Alias: CVE-2025-5399
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2381703 2381710
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-06-07 08:01 UTC by OSIDB Bzimport
Modified: 2025-09-17 15:17 UTC (History)
24 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2025:15699 0 None None None 2025-09-11 14:37:05 UTC
Red Hat Product Errata RHSA-2025:16046 0 None None None 2025-09-17 08:04:19 UTC

Description OSIDB Bzimport 2025-06-07 08:01:06 UTC 
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.
Comment 3 icholasogahn 2025-06-17 07:05:43 UTC 
When the flow of the web always tries to invade the device in a path that can be clicked wrong. How to exploit the above measure? https://unoonlinefree.io/
Comment 4 errata-xmlrpc 2025-09-11 14:37:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:15699 https://access.redhat.com/errata/RHSA-2025:15699
Comment 5 errata-xmlrpc 2025-09-17 08:04:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:16046 https://access.redhat.com/errata/RHSA-2025:16046
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