Vulnerability in Digitalbazaar Forge
CVE-2026-85393
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/advisories/GHSA-ppp5-5v6c-4jwp (related)
- github.com/digitalbazaar/forge (product)
- github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js (technical-description)
- github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js (technical-description)
- github.com/digitalbazaar/forge/issues/1149 (issue-tracking)
- www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85393?
- CVE-2026-85393 is a high-severity vulnerability in Digitalbazaar Forge, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-09-03.
- How severe is CVE-2026-85393?
- High severity. CVSS v3 base score is 7.5 out of 10.