Vulnerability DatabaseCVE-2026-85393
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CVE-2026-85393
Published:September 03, 2026
Updated:September 05, 2026
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.
Related Resources (8)
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85393.json
https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js
https://github.com/digitalbazaar/forge
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/blob/v1.4.0/lib/asn1.js
https://github.com/advisories/GHSA-ppp5-5v6c-4jwp
https://github.com/digitalbazaar/forge/issues/1149
https://nvd.nist.gov/vuln/detail/CVE-2026-85393
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Verification of Cryptographic Signature
CWE-347
EPSS
Base Score:
0.20