CVE-2021-41110
9.1
CRITICAL · CVSS 3.1 · EPSS 2.8% (pctl 86)
In your normal cycle
Critical by CVSS (9.1), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.1 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| EPSS | 2.81% — more likely to be exploited than 86% of all CVEs |
| Weakness | CWE-502 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-10-01 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| commonwl | cwlviewer |
References
- https://github.com/common-workflow-language/cwlviewer/commit/f6066f09edb70033a2ce80200e9fa9e70a5c29de
- https://github.com/common-workflow-language/cwlviewer/security/advisories/GHSA-7g7j-f5g3-fqp7
- https://www.fatalerrors.org/a/analysis-of-the-snakeyaml-deserialization-in-java-security.html
- https://github.com/common-workflow-language/cwlviewer/commit/f6066f09edb70033a2ce80200e9fa9e70a5c29de
- https://github.com/common-workflow-language/cwlviewer/security/advisories/GHSA-7g7j-f5g3-fqp7
- https://www.fatalerrors.org/a/analysis-of-the-snakeyaml-deserialization-in-java-security.html
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