CVE-2018-6594

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

lib/Crypto/PublicKey/ElGamal.py in PyCrypto through 2.6.1 generates weak ElGamal key parameters, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for PyCrypto's ElGamal implementation.

Metrics

CVSS 3.0 7.5/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-326

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/TElgamal/attack-on-pycrypto-elgamalThird Party Advisory
https://github.com/dlitz/pycrypto/issues/253Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00018.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202007-62
https://usn.ubuntu.com/3616-1/Third Party Advisory
https://usn.ubuntu.com/3616-2/Third Party Advisory
https://github.com/TElgamal/attack-on-pycrypto-elgamalThird Party Advisory
https://github.com/dlitz/pycrypto/issues/253Exploit, Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00018.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202007-62
https://usn.ubuntu.com/3616-1/Third Party Advisory
https://usn.ubuntu.com/3616-2/Third Party Advisory

Timeline

Published: Feb 3, 2018
Last modified: Jun 17, 2026
NVD status: Modified

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