Quick answers
- Is CVE-2026-123874 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123874 being exploited in the wild.
- How severe is CVE-2026-123874?
- High severity, with a CVSS score of 7.5, published 11 November 2026.
- Which products and versions are affected?
- OpenJS Foundation Node.js 26.x (26.9.0+), 24.x (24.22.0+).
- Is there a fix for CVE-2026-123874?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-123874 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-123874?
- Check whether you run OpenJS Foundation Node.js at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A use-after-free vulnerability exists in Node.js HTTP/2 when using respondWithFile() or respondWithFD(). An attacker can trigger the server to free an Http2Stream object while a write request pointing to it remains queued on the socket; when the write completes, the freed object is dereferenced and a virtual call is made through it. The vulnerability requires the application to serve files with respondWithFile() or respondWithFD() with default settings, and affects Node.js 26.x (26.9.0+) and 24.x (24.22.0+) over both TLS and cleartext connections.
Affected products
- OpenJS Foundation Node.js 26.x (26.9.0+), 24.x (24.22.0+)
Timeline
- 2026-11-11: disclosed