CVE-2026-85393

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.

Affected Platforms

Weakness Type

CWE-347

References

• https://github.com/advisories/GHSA-ppp5-5v6c-4jwp
• https://github.com/digitalbazaar/forge
• https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js
• https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js
• https://github.com/digitalbazaar/forge/issues/1149
• https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-sig…