CVE-2018-20325: There is a vulnerability in load() method in definitions/parser.py in the Danijar Hafner definitions package f

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CRITICAL 9.8REMOTEMITIGATE

CVE-2018-20325 is a critical-severity flaw (CVSS 9.8) affecting definitions. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is a vulnerability in load() method in definitions/parser.py in the Danijar Hafner definitions package for Python. It can execute arbitrary python commands resulting in command execution.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.5% (top 11%)
CISA exploited list	No
Weakness	CWE-94
Published	2018-12-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: definitions project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-21 23:29 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

definitions project definitions MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show definitions

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-20325?

definitions: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20325 being exploited?

CVE-2018-20325 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-20325 affect?

CVE-2018-20325 affects definitions. Severity is critical (CVSS 9.8). There is a vulnerability in load() method in definitions/parser.py in the Danijar Hafner definitions package for Python. It can execute arbitrary python commands resulting in command execution.

How urgent is CVE-2018-20325?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

References

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