What’s Vulnerable › Vulnerabilities

CVE-2021-43811: Code injection via unsafe YAML loading

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-08 · updated 2026-06-17
• Weakness: CWE-94

Description

Sockeye is an open-source sequence-to-sequence framework for Neural Machine Translation built on PyTorch. Sockeye uses YAML to store model and data configurations on disk. Versions below 2.3.24 use unsafe YAML loading, which can be made to execute arbitrary code embedded in config files. An attacker can add malicious code to the config file of a trained model and attempt to convince users to download and run it. If users run the model, the embedded code will run locally. The issue is fixed in version 2.3.24.

Affected products

• awslabs sockeye: before 2.3.24 — fixed in 2.3.24

How to fix

Upgrade to a fixed version: awslabs sockeye 2.3.24. Check the vendor advisory for mitigations.

References

• https://github.com/awslabs/sockeye/pull/964
• https://github.com/awslabs/sockeye/releases/tag/2.3.24
• https://github.com/awslabs/sockeye/security/advisories/GHSA-ggmr-44cv-24pm
• https://github.com/awslabs/sockeye/pull/964
• https://github.com/awslabs/sockeye/releases/tag/2.3.24
• https://github.com/awslabs/sockeye/security/advisories/GHSA-ggmr-44cv-24pm

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