CVE-2026-85393
CVE-2026-85393
node-forge through 1.4.0 fails to validate element count in nested DigestAlgorithm sequences during RSA PKCS#1 v1.5 signature verification. Attackers can embed garbage bytes inside the DigestAlgorithm sequence to forge valid signatures for arbitrary messages using low-exponent RSA keys. This is an incomplete fix for CVE-2026-33894.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-85393?
- CVE-2026-85393 is a high-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-09-03.
- How severe is CVE-2026-85393?
- High severity. CVSS v3 base score is 7.5 out of 10.