Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/advisories/GHSA-ppp5-5v6c-4jwp
- https://github.com/digitalbazaar/forge
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js
- https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js
- https://github.com/digitalbazaar/forge/issues/1149
- https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-sig
- https://github.com/advisories/GHSA-ppp5-5v6c-4jwp
FAQ
What is CVE-2026-85393?
CVE-2026-85393 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-85393?
CVE-2026-85393 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-85393?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.