CVE-2026-33895

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://datatracker.ietf.org/doc/html/rfc8032#section-8.4	Third Party Advisory
https://github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72fe78ff6dfa96b85	Patch
https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rw	Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:13826
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/security/cve/CVE-2026-33895
https://bugzilla.redhat.com/show_bug.cgi?id=2452457
https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rw	Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33895.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:digitalbazaar:forge:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-03-27 21:17

Updated : 2026-09-04 13:19

NVD link : CVE-2026-33895

Mitre link : CVE-2026-33895

CVE.ORG link : CVE-2026-33895

JSON object : View

Products Affected

digitalbazaar

forge

CWE

CWE-347

Improper Verification of Cryptographic Signature

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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."}], "lastModified": "2026-09-04T13:19:25.087", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:digitalbazaar:forge:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "46CBC667-ED99-4B5B-89C8-428CF52FD3FB", "versionEndIncluding": "1.3.3"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}