CVE-2026-85393

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-347
Vendor	digitalbazaar
Product	forge
Published	Sep 3, 2026
Last Updated	Sep 3, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

digitalbazaar / forge

0 ≤ 1.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/digitalbazaar/forge/issues/1149 github.com: https://github.com/digitalbazaar/forge github.com: https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js github.com: https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js github.com: https://github.com/advisories/GHSA-ppp5-5v6c-4jwp vulncheck.com: https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding

Credits

George Chen