RVD#2401: Use of unsafe yaml load, ./src/actionlib/tools/library.py:132

published 2020-08-20 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-2744

cvss: 8.0; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.0%; EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits: 0; none known

Use of unsafe yaml load. Allows instantiation of arbitrary objects. The flaw itself is caused by an unsafe parsing of YAML values which happens whenever an action message is processed to be sent, and allows for the creation of Python objects. Through this flaw in the ROS core package of actionlib, an attacker with local or remote access can make the ROS Master, execute arbitrary code in Python form. Consider yaml.safe_load() instead. Located first in actionlib/tools/library.py:132. See links for more info on the bug.

Patch / fix

distros 1 links 1

ros-actionlib Debian 14, Debian 13, Debian 12 1.13.1-4

debian advisories DEBIAN-CVE-2020-10289

github.com/ros/actionlib#171 pull request

Exploit prediction

1.98% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.0	CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

Open Robotics ros

Classification

Weakness

CWE-20 Improper Input Validation
CWE-502 Deserialization of Untrusted Data

References

github.com /ros/actionlib/pull/171
patch, third-party-advisory

Sources

CVE List CVE-2020-10289
NVD CVE-2020-10289

Fencer Vulns 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.

Summary