# CVE-2026-126051: Node.js is vulnerable to a remotely triggerable uncaught exception in TLS servers via deferred handshake callbacks

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

A deferred-callback use-after-destroy in Node.js TLS server handshake handling allows a remote, unauthenticated attacker to terminate the server process. When a TLS server uses any of the SNICallback, OCSPRequest, newSession, or resumeSession hooks, or server.addContext(), the corresponding OpenSSL callbacks are deferred, and the deferred code does not handle the underlying socket being destroyed between scheduling and execution. By sending a client hello that reaches the vulnerable path (for example, no SNI together with an OCSP request) followed by padding and a socket FIN, an attacker makes OpenSSL deliver the client hello and the end-of-file in the same tick, so the socket is destroyed before the deferred callback runs and the process raises an uncaught exception instead of emitting an 'error' event. This vulnerability affects Node.js 26.x and 24.x.

## 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-476

## 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-2026-126051; retrieved 2026-11-11; source updated 2026-11-11

Revision: e59ba8528abf8a28f3943e6c4896f9428bcff0d2a1a4539a622d5806335b90da

Canonical: https://y2.dev/cve/CVE-2026-126051

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