CVE-2026-4258 (GCVE-0-2026-4258)

Vulnerability from cvelistv5 – Published: 2026-03-17 05:00 – Updated: 2026-03-17 05:00
VLAI?
Summary
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.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
n/a sjcl Affected: 0 , < * (semver)
Credits
Kr0emer
Show details on NVD website
To clipboard 

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          "url": "https://gist.github.com/Kr0emer/2560f98edb10b0b34f2438cd63913c47"
        },
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          "url": "https://github.com/bitwiseshiftleft/sjcl/blob/master/core/ecc.js%23L454-L461"
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    "datePublished": "2026-03-17T05:00:04.199Z",
    "dateReserved": "2026-03-16T10:00:53.239Z",
    "dateUpdated": "2026-03-17T05:00:04.199Z",
    "state": "PUBLISHED"
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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