CVE•Published 2026-03-17•Modified 2026-06-03•0 articles on news•7 live references•NVD data

CVE-2026-4258Bitwiseshiftleft · Stanford_javascript_crypto_library

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS percentile

Exploit Prediction Scoring System · top 95% of all CVEs

Weaknesses (CWE)

CWE-347Improper Verification of Cryptographic Signature CWE-325Missing Cryptographic Step

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.

Timeline

Published 2026-03-17

Modified 2026-06-03

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-4258

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Bitwiseshiftleft Stanford Javascript Crypto Library"

All exposed Bitwiseshiftleft Stanford Javascript Crypto Library instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Stanford Javascript Crypto Library"

HTTP body or banner mentions "Stanford Javascript Crypto Library" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-4258