What is CVE-2026-4258?

CVE-2026-4258 is a high-severity vulnerability in Bitwiseshiftleft Stanford_javascript_crypto_library, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-03-17.

How severe is CVE-2026-4258?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Bitwiseshiftleft Stanford_javascript_crypto_library

CVE-2026-4258

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 c…

EPSS: 0.000 (7.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Bitwiseshiftleft Stanford_javascript_crypto_library
N/a Sjcl — versions 0

Weakness classification (CWE)

References

report@snyk.io (Exploit, Third Party Advisory)
report@snyk.io (Exploit, Third Party Advisory, Mitigation)
report@snyk.io (Broken Link)
report@snyk.io (Patch)

Frequently asked questions

What is CVE-2026-4258?: CVE-2026-4258 is a high-severity vulnerability in Bitwiseshiftleft Stanford_javascript_crypto_library, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-03-17.
How severe is CVE-2026-4258?: High severity. CVSS v3 base score is 7.5 out of 10.