CVE-2026-33895
CVE-2026-33895 · Forge has signature forgery in Ed25519 due to missing S > L check
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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.
CVSS 7.5 · Hoch · EPSS 0,5% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: system · node
Betroffene Produkte und Versionen
forge
- Softwareversionen
- < 1.4.0: Betroffen
Keine Korrektur veröffentlicht
node-forge npm
- Betroffene Versionsbereiche
- SEMVER: < 1.4.0
Auf 1.4.0 aktualisieren
node-node-forge Ubuntu:20.04:LTS
- Softwareversionen
- 0.8.5~dfsg-2
- 0.9.1~dfsg-1
- Betroffene Versionsbereiche
- ECOSYSTEM: (−∞, +∞)
Keine Korrektur veröffentlicht
node-node-forge Ubuntu:22.04:LTS
- Softwareversionen
- 0.10.0~dfsg-3
- 1.2.1~dfsg-2
- Betroffene Versionsbereiche
- ECOSYSTEM: (−∞, +∞)
Keine Korrektur veröffentlicht
Originalquellen
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rw
- https://github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72fe78ff6dfa96b85
- https://datatracker.ietf.org/doc/html/rfc8032#section-8.4
- https://access.redhat.com/security/cve/CVE-2026-33895
- https://bugzilla.redhat.com/show_bug.cgi?id=2452457
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33895.json
- https://access.redhat.com/errata/RHSA-2026:24761
- https://access.redhat.com/errata/RHSA-2026:34342
- https://access.redhat.com/errata/RHSA-2026:9742
- https://access.redhat.com/errata/RHSA-2026:13826
- https://nvd.nist.gov/vuln/detail/CVE-2026-33895