CVE-2026-85393 Details
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.
A vulnerability in node-forge versions through 1.4.0 allows for RSA PKCS#1 v1.5 signature forgery. The issue arises because the library fails to properly validate the element count in nested DigestAlgorithm sequences during signature verification. This flaw enables attackers to embed extraneous bytes within the DigestAlgorithm sequence, thereby manipulating the signature process. The vulnerability is particularly concerning for low-exponent RSA keys, as it allows for the creation of valid signatures on arbitrary messages. This issue is an incomplete fix for a previously identified vulnerability, CVE-2026-33894.
Users can upgrade to node-forge version 1.4.1 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 3, 2026CISA-ADP
Assessed Sep 3, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/advisories/GHSA-ppp5-5v6c-4jwp | CISA-ADP | AdvisoryBundleExploitRemedyVendor |
| https://github.com/advisories/GHSA-ppp5-5v6c-4jwp | [email protected] | AdvisoryBundleExploitRemedyVendor |
| https://github.com/digitalbazaar/forge | [email protected] | Vendor |
| https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js | [email protected] | Source CodeVendor |
| https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js | [email protected] | Source CodeVendor |
| https://github.com/digitalbazaar/forge/issues/1149 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding | [email protected] | AdvisoryBundle |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-347 | Improper Verification of Cryptographic Signature | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| digitalbazaar/forge | <= 1.4.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 3, 2026 | CVE Modified | CISA-ADP |
| Sep 3, 2026 | New CVE Received | [email protected] |