CVE & CISA-KEV Catalog

CVE-2018-6594

HIGHEPSS 80th pctl
7.5
CVSS v3
NVD

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.

CWE-326

How to fix

Remediation Available
python-crypto-debugsourceAmazon
Fixed in:0:2.6.1-34.amzn2023.0.2
Fixed in:0:2.6.1-34.amzn2023.0.2
Fixed in:0:2.6.1-34.amzn2023.0.2
python3-cryptoAmazon
Fixed in:0:2.6.1-34.amzn2023.0.2
Fixed in:0:2.6.1-34.amzn2023.0.2
Fixed in:0:2.6.1-34.amzn2023.0.2
python3-crypto-debuginfoAmazon
Fixed in:0:2.6.1-34.amzn2023.0.2
Fixed in:0:2.6.1-34.amzn2023.0.2
Fixed in:0:2.6.1-34.amzn2023.0.2
pycryptodomeDebian
Fixed in:3.4.11-1CVE-2018-6594
Fixed in:3.4.11-1CVE-2018-6594
Fixed in:3.4.11-1CVE-2018-6594
python-cryptoUbuntu
Fixed in:2.6.1-4ubuntu0.3USN-3616-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2.6.1-6ubuntu0.16.04.3USN-3616-1

This Ubuntu release reached end-of-life on 2021-04-02.

python3-cryptoUbuntu
Fixed in:2.6.1-4ubuntu0.3USN-3616-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2.6.1-6ubuntu0.16.04.3USN-3616-1

This Ubuntu release reached end-of-life on 2021-04-02.

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

2.03%probability of exploitation in 30 days
80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Exploit1
Other references1

Related Vulnerabilities

Other CWE-326 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2014-0224High7.495%-Fix
CVE-2017-1000486Critical9.894%KEVFix
CVE-2013-2566Medium5.984%-Fix
CVE-2017-11317Critical9.884%KEV-
CVE-2018-18325High7.574%KEV-
CVE-2018-15811High7.574%KEV-

Common questions

How do I fix CVE-2018-6594?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-6594 being actively exploited?

Not that we know of. CVE-2018-6594 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 80% of all scored CVEs.

How severe is CVE-2018-6594?

CVE-2018-6594 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-6594 affect?

Published advisories record a fix for python-crypto-debugsource (Amazon), python3-crypto (Amazon), python3-crypto-debuginfo (Amazon), pycryptodome (Debian), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.