Use After Free Affecting warmcat/libwebsockets package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-WARMCATLIBWEBSOCKETS-13645006
- published21 Oct 2025
- disclosed20 Oct 2025
- creditUnknown
Introduced: 20 Oct 2025
NewCVE-2025-11677 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Use After Free via the lws_handshake_server function when a user-provided callback handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE. An attacker can cause a crash or disrupt service by triggering the callback under specific conditions.
Note:
This is only exploitable if the application is configured to use a custom callback for LWS_CALLBACK_HTTP_CONFIRM_UPGRADE.