CVE-2021-41110

CRITICAL 9.8CVE-2021-41110 · Published 01/10/2021 · updated 17/06/2026

In short

CVE-2021-41110 is a CRITICAL (CVSS 9.8) vulnerability affecting cwlviewer (commonwl).
Chance of exploitation in the next 30 days (EPSS): 2.8%, higher than 86.6% of all vulnerabilities.
Fix: update to 1.3.1 or later.

Package	Affected versions	Patched versions
cwlviewer commonwl	`< 1.3.1`	`1.3.1`

Description

cwlviewer is a web application to view and share Common Workflow Language workflows. Versions prior to 1.3.1 contain a Deserialization of Untrusted Data vulnerability. Commit number f6066f09edb70033a2ce80200e9fa9e70a5c29de (dated 2021-09-30) contains a patch. There are no available workarounds aside from installing the patch. The SnakeYaml constructor, by default, allows any data to be parsed. To fix the issue the object needs to be created with a `SafeConstructor` object, as seen in the patch.

References

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