{"id":"UBUNTU-CVE-2026-85393","details":"node-forge through 1.4.0 fails to validate element count in nested DigestAlgorithm sequences during RSA PKCS#1 v1.5 signature verification. Attackers can embed garbage bytes inside the DigestAlgorithm sequence to forge valid signatures for arbitrary messages using low-exponent RSA keys. This is an incomplete fix for CVE-2026-33894.","modified":"2026-09-16T11:43:10Z","published":"2026-09-03T19:17:00Z","upstream":["CVE-2026-85393"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-85393"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-85393"},{"type":"REPORT","url":"https://github.com/advisories/GHSA-ppp5-5v6c-4jwp"},{"type":"REPORT","url":"https://github.com/digitalbazaar/forge"},{"type":"REPORT","url":"https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/asn1.js"},{"type":"REPORT","url":"https://github.com/digitalbazaar/forge/blob/v1.4.0/lib/rsa.js"},{"type":"REPORT","url":"https://github.com/digitalbazaar/forge/issues/1149"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/node-forge-through-1.4.0-rsa-pkcs-1-1.5-signature-forgery-via-nested-digestalgorithm-padding"}],"affected":[{"package":{"name":"node-node-forge","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-node-forge?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-2026-85393.json"}},{"package":{"name":"node-node-forge","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-node-forge?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_version":"1.2.1~dfsg-2","binary_name":"libjs-node-forge"},{"binary_version":"1.2.1~dfsg-2","binary_name":"node-node-forge"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85393.json"}}],"schema_version":"1.9.0","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":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}