digitalbazaar/forge · Security
node-forge RSA PKCS#1 v1.5 signature verification accepts extra nested DigestAlgorithm elements
- GHSA ID
- GHSA-86w9-cpqp-85rv
- CVE ID
- CVE-2026-85393
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS v4
- 8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
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.
CWEs
- CWE-347 · Improper Verification of Cryptographic Signature
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-85393 ↗
- https://github.com/digitalbazaar/forge/issues/1149 ↗
- https://github.com/advisories/GHSA-ppp5-5v6c-4jwp ↗
- 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://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding ↗
- https://github.com/digitalbazaar/forge/pull/1152 ↗
- https://github.com/advisories/GHSA-86w9-cpqp-85rv ↗