CVE-2026-85393

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

Published Sep 3, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-86w9-cpqp-85rv node-forge RSA PKCS#1 v1.5 signature verification accepts extra nested DigestAlgorithm elements
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title node-forge through 1.4.0 RSA PKCS#1 v1.5 Signature Forgery via Nested DigestAlgorithm Padding
First Time appeared Digitalbazaar
Digitalbazaar forge
Weaknesses CWE-347
CPEs cpe:2.3:a:digitalbazaar:forge:*:*:*:*:*:*:*:*
Vendors & Products Digitalbazaar
Digitalbazaar forge
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 3, 2026, 7:14 PM
Reserved
Sep 3, 2026, 6:10 PM
Status
Deferred
Published
Sep 3, 2026, 7:17 PM
Modified
Sep 24, 2026, 8:43 PM
Severity
Important
Public date
Sep 3, 2026, 6:54 PM