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CVE

CVE-2026-4258

sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey
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CVE

CVE-2026-4258

sjcl is missing point-on-curve validation in sjcl.ecc.basicKey.publicKey

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.7
-
4.0
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
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
C
H
U
-

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-4258, https://github.com/bitwiseshiftleft/sjcl/commit/ee307459972442a17beebc29dc331fffd8aff796, https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47, https://github.com/bitwiseshiftleft/sjcl, https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js#L454-L461, https://security.snyk.io/vuln/SNYK-JS-SJCL-15369617

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00019%
EPSS Percentile
0.05346%
Introduced Version
0
Fix Available
1.0.9

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