Code injection in Danijar Definitions

published 2018-12-21 7y ago modified 2026-06-17 4mo ago also GHSA-v4x4-98cg-wr4g , PYSEC-2018-82 , EUVD-2018-0031

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.5%; EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits: 0; none known

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.

Is CVE-2018-20325 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

3.46% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/danijar/definitions/issues/14 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	definitions	<=0.2.0 all versions	no fix listed

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

github.com /danijar/definitions/issues/14
web, exploit, third-party-advisory, report
nvd.nist.gov /vuln/detail/CVE-2018-20325
advisory
github.com /advisories/GHSA-v4x4-98cg-wr4g
advisory
github.com /danijar/definitions
package
github.com /pypa/advisory-database/tree/main/vulns/definitions/PYSEC-2018-82.yaml
web

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.