Quick answers
- Is CVE-2026-123875 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123875 being exploited in the wild.
- How severe is CVE-2026-123875?
- Medium severity, with a CVSS score of 5.9, published 11 November 2026.
- Which products and versions are affected?
- OpenJS Foundation Node.js 26.x, 24.x, 22.x.
- Is there a fix for CVE-2026-123875?
- 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-2026-123875 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-123875?
- 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 NULL pointer dereference occurs in the HTTP/2 StreamPipe when a client cancels a file-download request initiated via stream.respondWithFile() or stream.respondWithFD(). The StreamPipe teardown occurs in an order that leaves a dangling pointer, which is subsequently dereferenced, aborting the process. The attack requires no crafted frames; a handful of cancelled requests against a default file-serving handler is sufficient. This affects both TLS and cleartext HTTP/2.
Affected products
- OpenJS Foundation Node.js 26.x, 24.x, 22.x
Timeline
- 2026-11-11: disclosed