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.
Affected products
digitalbazaar: forge
References10
- github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28… Vendor Advisory
- github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28… Vendor Advisory
- github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72… Patch
- datatracker.ietf.org/doc/html/rfc8032#section-8.4 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:13826
- access.redhat.com/errata/RHSA-2026:24761
- access.redhat.com/errata/RHSA-2026:34342
- access.redhat.com/errata/RHSA-2026:9742
- access.redhat.com/security/cve/CVE-2026-33895
- bugzilla.redhat.com/show_bug.cgi?id=2452457
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - EPSS — exploit probability
- 1% percentile: 45 · as of 12 November 2026
- CWE
- CWE-347
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