CVE-2026-85393
node-forge through 1.4.0 RSA PKCS#1 v1.5 Signature Forgery via Nested DigestAlgorithm Padding
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 3, 2026
- Updated
- Sep 3, 2026
- Reserved
- Sep 3, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | VulnCheck |
Weaknesses
- CWE-347 Improper Verification of Cryptographic Signature
Affected Products
| Product | Versions |
|---|---|
forgedigitalbazaar |
|
References
- GitHub Issue #1149issue-tracking
- https://github.com/digitalbazaar/forgeproduct
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.jstechnical-description
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.jstechnical-description
- GitHub Security Advisory (GHSA-ppp5-5v6c-4jwp)related
- VulnCheck Advisory: node-forge through 1.4.0 RSA PKCS#1 v1.5 Signature Forgery via Nested DigestAlgorithm Paddingthird-party-advisory
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