{"id":"UBUNTU-CVE-2026-33895","details":"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.","modified":"2026-04-02T17:31:27Z","published":"2026-03-27T21:17:00Z","upstream":["CVE-2026-33895"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-33895"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-33895"},{"type":"REPORT","url":"https://datatracker.ietf.org/doc/html/rfc8032#section-8.4"},{"type":"REPORT","url":"https://github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72fe78ff6dfa96b85"},{"type":"REPORT","url":"https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rw"}],"affected":[{"package":{"name":"node-node-forge","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-node-forge@0.9.1~dfsg-1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.5~dfsg-2","0.9.1~dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libjs-node-forge","binary_version":"0.9.1~dfsg-1"},{"binary_name":"node-node-forge","binary_version":"0.9.1~dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33895.json"}},{"package":{"name":"node-node-forge","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-node-forge@1.2.1~dfsg-2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.0~dfsg-3","1.2.1~dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libjs-node-forge","binary_version":"1.2.1~dfsg-2"},{"binary_name":"node-node-forge","binary_version":"1.2.1~dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33895.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}