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CVE-2026-85393

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

Published: Sep 3, 2026Updated: Sep 3, 2026 Sources: CVE List NVDCWE-347
7.5HIGH
NVD MITRE
EPSS Score
0.2%
Top 90.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-347

Affected Products

digitalbazaar
commercialaka digitalbazaar/forge
forgeLibrary
Security Products / pki-crypto

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/advisories/GHSA-ppp5-5v6c-4jwp
github.com
https://github.com/digitalbazaar/forge
github.com
https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js
github.com
and 3 more references View all →

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