CVE-2021-33575

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-25 · updated 2026-06-17

Description

The Pixar ruby-jss gem before 1.6.0 allows remote attackers to execute arbitrary code because of the Plist gem's documented behavior of using Marshal.load during XML document processing.

Affected products

Pixar Ruby-Jss: before 1.6.0 — fixed in 1.6.0

How to fix

Upgrade to a fixed version: Pixar Ruby-Jss 1.6.0. Check the vendor advisory for mitigations.

References

https://github.com/PixarAnimationStudios/ruby-jss/blob/e6d48dd8c77f9275c76787d60d3472615fcd9b77/CHANGES.md#160---2021-05-24
https://github.com/patsplat/plist/tree/ce8f9ae42a114f603ea200c955e420782bffc4ad#label-Security+considerations
https://github.com/PixarAnimationStudios/ruby-jss/blob/e6d48dd8c77f9275c76787d60d3472615fcd9b77/CHANGES.md#160---2021-05-24
https://github.com/patsplat/plist/tree/ce8f9ae42a114f603ea200c955e420782bffc4ad#label-Security+considerations

Get alerted when CVE-2021-33575 or the next vulnerability affects your stack