CVE-2026-4258
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | n/a |
| Product | sjcl |
| Published | Mar 17, 2026 |
| Last Updated | Mar 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
n/a / sjcl
0 < *
References
security.snyk.io: https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617 gist.github.com: https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47 github.com: https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461 github.com: https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796
Credits
Kr0emer