Quick answers
- Is CVE-2026-123868 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123868 being exploited in the wild.
- How severe is CVE-2026-123868?
- 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.
- Is there a fix for CVE-2026-123868?
- 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-2026-123868 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-123868?
- 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
The vulnerability exploits HTTP/2 stream receive buffers that are not charged against the session memory budget. An attacker sends small one-byte DATA frames that fill a stream's receive window; each frame creates a JavaScript Buffer view in the receiving queue, but the session memory counter never accounts for it. This allows an attacker to retain ~114 bytes per frame on the server while sending only ~10 wire bytes per frame, enabling rapid memory exhaustion on a single stream within one connection.
Affected products
- OpenJS Foundation Node.js 26.x, 24.x
Timeline
- 2026-11-11: disclosed