bitwiseshiftleft/sjcl · Security
sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey
- GHSA ID
- GHSA-2w8x-224x-785m
- CVE ID
- CVE-2026-4258
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS v4
- 7.7 · 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
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.
CWEs
- CWE-325 · Missing Cryptographic Step
- CWE-347 · Improper Verification of Cryptographic Signature
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-4258 ↗
- https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796 ↗
- https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47 ↗
- https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617 ↗
- https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js#L454-L461 ↗
- https://github.com/advisories/GHSA-2w8x-224x-785m ↗