What’s Vulnerable › Vulnerabilities

CVE-2026-85393: node-forge through 1.4.0 RSA PKCS#1 v1.5 Signature Forgery via Nested DigestAlgorithm Padding

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-03 · updated 2026-09-24
• Weakness: CWE-347

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.

Affected products

• digitalbazaar forge: through 1.4.0

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-signature-forgery-via-nested-digestalgorithm-padding
• https://github.com/advisories/GHSA-ppp5-5v6c-4jwp

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