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Vulnerabilities CVE-2026-33895

CVE-2026-33895

High
Open
TLP:CLEAR

Forge has signature forgery in Ed25519 due to missing S > L check

NVD CVE.org
Critical Infrastructure

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Description

Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, Ed25519 signature verification accepts forged non-canonical signatures where the scalar S is not reduced modulo the group order (`S >= L`). A valid signature and its `S + L` variant both verify in forge, while Node.js `crypto.verify` (OpenSSL-backed) rejects the `S + L` variant, as defined by the specification. This class of signature malleability has been exploited in practice to bypass authentication and authorization logic (see CVE-2026-25793, CVE-2022-35961). Applications relying on signature uniqueness (i.e., dedup by signature bytes, replay tracking, signed-object canonicalization checks) may be bypassed. Version 1.4.0 patches the issue.

Details

CVSS Score
7.5
EPSS Score
0.54%

42.7th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Confidence
90%
Published
Mar 27, 2026
Last Modified
Jul 15, 2026
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