Out-of-bounds Write Affecting nodejs20 package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.55% (47th percentile)

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  • Snyk IDSNYK-RHEL10-NODEJS20-22438615
  • published12 Nov 2026
  • disclosed11 Nov 2026

Introduced: 11 Nov 2026

NewCVE-2026-123828  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 nodejs20.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nodejs20 package and not the nodejs20 package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

A one-byte heap buffer overflow in Node.js HTTP/2 Alt-Svc handling lets a remote, unauthenticated attacker corrupt process memory. When an application passes an attacker-controlled value such as a request's :authority header to Http2Session.altsvc(), the AltSvc implementation in src/node_http2.cc allocates a buffer sized to the origin length and then writes it with a null terminator, placing one byte past the end of the allocation. A single request carrying a long but syntactically valid :authority triggers the out-of-bounds write, which aborts the process and serves as a remote heap-corruption primitive. This vulnerability affects Node.js 26.x and 24.x.

CVSS Base Scores

version 3.1