VU#725167: node-forge Signature Forgery Vulnerabilities in RSA-PKCS and ED25519 Implementations

Summary

Overview Two distinct cryptographic signature verification vulnerabilities exist in Digital Bazaar node-forge, a widely used JavaScript library implementing cryptographic primitives for Node.js and browser environments. These vulnerabilities allow attackers to forge RSA (PKCS#1 v1.5) and Ed25519 signatures under specific, exploitable conditions. Description Both vulnerabilities stem from insufficient enforcement of canonical cryptographic structures during verification: in the RSA case, non-standard ASN.1 encodings and undersized padding are accepted; in the Ed25519 case, non-canonical signature scalars are not rejected. As a result, node-forge accepts signatures that appear valid internally but are rejected by industry-standard libraries such as OpenSSL and Node.js’s native crypto module. The vulnerabilities affect node-forge versions... Related CVEs: CVE-2026-33894, CVE-2026-33895.

Why it matters

CERT/CC notes often cover coordinated disclosures, multi-vendor exposure, infrastructure risk, or cases where remediation guidance is still developing.

Operator check

Review the CERT/CC Vulnerability Note and compare the affected vendor and product list against your inventory. Apply vendor fixes or compensating controls for and ED25519 Implementations where available.

Sources