Use After Free Affecting nodejs 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-CONAN-NODEJS-22469239
- published12 Nov 2026
- disclosed11 Nov 2026
- creditChris Rohlf
Introduced: 11 Nov 2026
NewCVE-2026-123864 (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 due to a re-entrancy flaw in TLSWrap::DoWrite(), which calls ClearOut() directly on a zero-length write and re-enters llhttp_execute() while the HTTP parser is still in the on_body callback. An attacker can read freed or unrelated heap memory, including TLS private keys and other users' requests, through a use-after-free and an out-of-bounds read that copy the memory into the request body. Only HTTPS servers with a handler that calls res.flushHeaders() before the request body ends and later calls res.end() with a non-empty chunk are affected, and the leaked memory is readable only through a route that echoes or stores the request body.