# CVE-2026-123874: Node.js is vulnerable to an HTTP/2 use-after-free via respondWithFile() stream reset during a pending write

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

A use-after-free in Node.js HTTP/2 lets an unauthenticated client corrupt server memory, over both TLS and cleartext, when the server serves files with respondWithFile() or respondWithFD(). A client can make the server free an Http2Stream while a write request that points to it is still queued on the socket; when that write completes, the code dereferences and makes a virtual call through the freed object. The only precondition is that the application serves a file with stream.respondWithFile() or stream.respondWithFD(), with default settings otherwise. This vulnerability affects Node.js 26.x (since 26.9.0) and 24.x (since 24.22.0).

## Remediation

No remediation reported in collected sources

## Affected products and versions

- nodejs / node: ≥ 24.0.0; < 24.22.3 (affected, semver); ≥ 25.0.0; < 26.13.1 (affected, semver). Source: CNA: openjs

## Severity and prioritization

- CVSS 3.0: 7.5 (high); CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: openjs

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-416

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://nodejs.org/en/blog/vulnerability/november-2026-security-releases (CNA: openjs; vendor-advisory)

- https://cna.openjsf.org/security-advisories.html (CNA: openjs)

## Provenance

- CNA: openjs: https://www.cve.org/CVERecord?id=CVE-2026-123874; retrieved 2026-11-11; source updated 2026-11-11

Revision: 0581e4e06863822fd00a14c43f08b0c837f254a5b9435e8c7dd0d8aaeac21f89

Canonical: https://y2.dev/cve/CVE-2026-123874

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