GHSA-86w9-cpqp-85rv

node-forge RSA PKCS#1 v1.5 signature verification accepts extra nested DigestAlgorithm elements

Source: GitHub Advisory Database (reviewed) High CVE-2026-85393

Packages

Ecosystem	Package	Affected	Fixed in
npm	node-forge	<= 1.4.0	no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.

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