FKIE_CVE-2026-33895

Vulnerability from fkie_nvd - Published: 2026-03-27 21:17 - Updated: 2026-10-26 22:10
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://datatracker.ietf.org/doc/html/rfc8032#section-8.4Third Party Advisory
security-advisories@github.comhttps://github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72fe78ff6dfa96b85Patch
security-advisories@github.comhttps://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rwVendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:13826
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:24761
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34342
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:9742
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-33895
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2452457
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rwVendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33895.json
Impacted products
Vendor Product Version
digitalbazaar forge *
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "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 \u003e= 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."
    },
    {
      "lang": "es",
      "value": "Forge (tambi\u00e9n llamado \u2019node-forge\u2019) es una implementaci\u00f3n nativa de Seguridad de la Capa de Transporte en JavaScript. Antes de la versi\u00f3n 1.4.0, la verificaci\u00f3n de firmas Ed25519 acepta firmas no can\u00f3nicas forjadas donde el escalar S no se reduce m\u00f3dulo el orden del grupo (\u2019S \u003e= L\u2019). Una firma v\u00e1lida y su variante \u2019S + L\u2019 ambas verifican en forge, mientras que \u2019crypto.verify\u2019 de Node.js (respaldado por OpenSSL) rechaza la variante \u2019S + L\u2019, seg\u00fan lo definido por la especificaci\u00f3n. Esta clase de maleabilidad de firmas ha sido explotada en la pr\u00e1ctica para eludir la l\u00f3gica de autenticaci\u00f3n y autorizaci\u00f3n (ver CVE-2026-25793, CVE-2022-35961). Las aplicaciones que dependen de la unicidad de la firma (es decir, deduplicaci\u00f3n por bytes de firma, seguimiento de repeticiones, comprobaciones de canonicidad de objetos firmados) pueden ser eludidas. La versi\u00f3n 1.4.0 corrige el problema."
    }
  ],
  "id": "CVE-2026-33895",
  "lastModified": "2026-10-26T22:10:00.163",
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}



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