Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Digitalbazaar | Forge | <= 1.3.3 |
Related Weaknesses (CWE)
References
- https://datatracker.ietf.org/doc/html/rfc8032#section-8.4Third Party Advisory
- https://github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72fe78ff6dfPatch
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rwVendor Advisory
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rwVendor Advisory
FAQ
What is CVE-2026-33895?
CVE-2026-33895 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 wh...
How severe is CVE-2026-33895?
CVE-2026-33895 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33895?
Check the references section above for vendor advisories and patch information. Affected products include: Digitalbazaar Forge.