GitHub Advisoryadvisory · npm
GHSA-86w9-cpqp-85rv node-forge RSA PKCS#1 v1.5 signature verification accepts extra nested DigestAlgorithm elements
HIGH
Official page ↗
- Aliases
- CVE-2026-85393
- Ecosystem
- npm
- Packages
- node-forge
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-347
- Reviewed
- 2026-10-01
Affected packages
• npm node-forge: <= 1.4.0 (no fix yet)
Description
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.
Related
Alias · CVE (1)
- 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. vulnerability
Weakness · CWE (1)
- CWE-347 Improper Verification of Cryptographic Signature weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-85393 advisory
- https://github.com/digitalbazaar/forge/issues/1149 web
- https://github.com/digitalbazaar/forge/pull/1152 web
- https://github.com/advisories/GHSA-ppp5-5v6c-4jwp advisory
- https://github.com/digitalbazaar/forge package
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js web
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js web
- https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding web