CVE-2026-85393CWE-347

CVE-2026-85393

High · published September 3, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
24.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
8.7 · 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
EPSS
0.00326 · 24.4th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-09-03T23:17Z
References (7)
https://github.com/advisories/GHSA-ppp5-5v6c-4jwp · [email protected]https://github.com/digitalbazaar/forge · [email protected]https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js · [email protected]https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js · [email protected]https://github.com/digitalbazaar/forge/issues/1149 · [email protected]https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding · [email protected]https://github.com/advisories/GHSA-ppp5-5v6c-4jwp · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 05 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 03 SEP 18:54Z
    node-forge through 1.4.0 RSA PKCS#1 v1.5 Signature Forgery via Nested DigestAlgorithm Padding
    cvelistv5