CVE-2026-33895
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-03-27 21:17:26.157000
Last modified
2026-10-26 22:10:00.163000
View original CVE JSON
{
"id": "CVE-2026-33895",
"sourceIdentifier": "[email protected]",
"published": "2026-03-27T21:17:26.157",
"lastModified": "2026-10-26T22:10:00.163",
"vulnStatus": "Modified",
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"value": "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."
},
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"value": "Forge (también llamado ’node-forge’) es una implementación nativa de Seguridad de la Capa de Transporte en JavaScript. Antes de la versión 1.4.0, la verificación de firmas Ed25519 acepta firmas no canónicas forjadas donde el escalar S no se reduce módulo el orden del grupo (’S >= L’). Una firma válida y su variante ’S + L’ ambas verifican en forge, mientras que ’crypto.verify’ de Node.js (respaldado por OpenSSL) rechaza la variante ’S + L’, según lo definido por la especificación. Esta clase de maleabilidad de firmas ha sido explotada en la práctica para eludir la lógica de autenticación y autorización (ver CVE-2026-25793, CVE-2022-35961). Las aplicaciones que dependen de la unicidad de la firma (es decir, deduplicación por bytes de firma, seguimiento de repeticiones, comprobaciones de canonicidad de objetos firmados) pueden ser eludidas. La versión 1.4.0 corrige el problema."
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