{"id":"CVE-2026-4258","aliases":["EUVD-2026-12542","GHSA-2w8x-224x-785m"],"status":"published","title":"sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey","description":"Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00261,"percentile":0.17953,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-325","CWE-347"],"published":"2026-03-17T05:00:04Z","modified":"2026-10-28T02:30:28Z","fixes":[{"ecosystem":"npm","package":"sjcl","fixed_in":["1.0.9"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"sjcl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.0.8"},{"fixed":"1.0.9"}]}]},{"source":"osv","ecosystem":"npm","package":"sjcl","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.0.9"}]}]}],"products":[{"vendor":"bitwiseshiftleft","product":"stanford_javascript_crypto_library"}],"references":[{"url":"https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617","tags":["exploit","Exploit","Third Party Advisory","web"]},{"url":"https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15751243","tags":["web"]},{"url":"https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47","tags":["exploit","Exploit","Mitigation","Third Party Advisory","web"]},{"url":"https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461","tags":["Broken Link","web"]},{"url":"https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796","tags":["Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4258","tags":["advisory"]},{"url":"https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js#L454-L461","tags":["web"]},{"url":"https://github.com/advisories/GHSA-2w8x-224x-785m"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4258.json","tags":["advisory"]},{"url":"https://github.com/bitwiseshiftleft/sjcl","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-4258","description":"Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.","status":"published","published":"2026-03-17T05:00:04.199Z","modified":"2026-08-07T15:25:31.786Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P","level":"high","assessor":"cna"}],"cwes":["CWE-347","CWE-325"],"updated_at":"2026-11-02T14:19:59.369956Z"}],"euvd":[{"id":"EUVD-2026-12542","description":"Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.","status":"published","published":"2026-03-17T05:00:04Z","modified":"2026-08-07T15:25:31Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"updated_at":"2026-11-02T18:02:07.294457Z"}],"ghsa":[{"id":"GHSA-2w8x-224x-785m","title":"sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey","description":"All versions of the package sjcl are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.","status":"published","published":"2026-03-17T06:31:32Z","modified":"2026-03-25T14:36:31Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-325","CWE-347"],"updated_at":"2026-11-02T14:39:41.724707Z"}],"nvd":[{"id":"CVE-2026-4258","description":"Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.","status":"published","published":"2026-03-17T06:16:18.59Z","modified":"2026-07-28T16:18:22.213Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-347","CWE-325"],"updated_at":"2026-11-02T14:12:09.735529Z"}],"osv":[{"id":"CVE-2026-4258","description":"Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.","status":"published","published":"2026-03-17T05:00:04.199Z","modified":"2026-10-28T02:30:28.495536119Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:45:04.117819Z"},{"id":"GHSA-2w8x-224x-785m","title":"sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey","description":"All versions of the package sjcl are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.","status":"published","published":"2026-03-17T06:31:32Z","modified":"2026-03-25T14:46:29.609642Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"cwes":["CWE-325","CWE-347"],"updated_at":"2026-11-02T15:46:34.700741Z"}]}}