# Node.js patches multiple HTTP/2, TLS vulnerabilities

Published: 2026-11-12 · Severity: routine · Sectors: Technology
Canonical: https://vorant.io/reports/35aac048-45e8-5584-9700-39eaac5048d4/node-js-patches-multiple-http-2-tls-vulnerabilities
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> NCSC-NL advisory details multiple Node.js vulnerabilities in HTTP/2, HTTPS, and TLS handling, fixed in versions 22.23.0, 24.17.0/24.18.0 and 26.x.

Source: advisories.ncsc.nl — https://advisories.ncsc.nl/2026/ncsc-2026-0492.html

## What to check

- Applies to: The 16 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation: No exploitation in the wild and no public exploit is recorded for the CVEs named.

NCSC-NL published an advisory covering a batch of vulnerabilities patched in Node.js versions 22.x, 24.x and 26.x. The flaws span the HTTP/2 implementation, HTTPS server module, TLS handling, and proxy error handling, and include heap-based buffer overflow, use-after-free, NULL pointer dereference, out-of-bounds write, improper certificate validation, and information disclosure issues. Impacts range from server crashes and memory corruption to leakage of sensitive data including TLS private keys, bypass of client-certificate authentication under TLS 1.2, incorrect TLS session reuse across differing certificate configurations, credential leakage via proxy authentication error messages, and a file-watching access-control bypass on macOS and Windows.

Environments that terminate TLS/HTTPS or expose HTTP/2 endpoints in Node.js are most at risk, since several of the higher-severity issues (CVSS up to 8.2) directly affect those code paths. No active exploitation is mentioned in the advisory. Defenders running Node.js should upgrade to the patched releases (22.23.0, 24.17.0/24.18.0, or the fixed 26.x line) and review the referenced CVEs for applicability to their deployment, prioritising services exposing HTTPS/TLS and HTTP/2 to untrusted networks.

## Mentioned in this report

- Vulnerabilities: CVE-2026-123828, CVE-2026-123829, CVE-2026-123862, CVE-2026-123863, CVE-2026-123864, CVE-2026-123865, CVE-2026-123866, CVE-2026-123867, CVE-2026-123868, CVE-2026-123871, CVE-2026-123872, CVE-2026-123874, CVE-2026-123875, CVE-2026-123877, CVE-2026-126051, CVE-2026-48615

Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0492.html

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