What is CVE-2026-58040?

CVE-2026-58040 is a medium-severity vulnerability in Node.js Node, classified under Improper Validation of Certificate with Host Mismatch. CVSS score: 6.3/10. Published 2026-07-30.

How severe is CVE-2026-58040?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Node.js Node

CVE-2026-58040

An incomplete fix has been identified in Node.js: HTTPS Agent TLS session reuse skips hostname verification across identity policies (incomplete fix of CVE-2026-48934). This vulnerability affects Node.js **22.x**, **24.x**, and **26.x**.

EPSS: 0.003 (19.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Nodejs Node — versions 22.23.1, 24.18.0, 26.5.0

Weakness classification (CWE)

CWE-297 — Improper Validation of Certificate with Host Mismatch

References

support@hackerone.com

Frequently asked questions

What is CVE-2026-58040?: CVE-2026-58040 is a medium-severity vulnerability in Node.js Node, classified under Improper Validation of Certificate with Host Mismatch. CVSS score: 6.3/10. Published 2026-07-30.
How severe is CVE-2026-58040?: Medium severity. CVSS v3 base score is 6.3 out of 10.