CVE-2026-83551 Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK @step/@remote pipeline path
An authenticated user can extract HMAC keys from API responses to forge signatures and execute code in another user's pipeline context.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83551?
CVE-2026-83551 is a high-severity vulnerability in AWS sagemaker-python-sdk, published on 1 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Cleartext storage of sensitive information in the @step and @remote decorator pipeline component in Amazon SageMaker Python SDK before v3.11.0 and v2.256.0 might allow an authenticated remote user to extract the HMAC signing key from SageMaker DescribePipeline API responses and forge valid integrity signatures for specially crafted function payloads, achieving code execution in another user's pipeline execution context within the same AWS account.
Weakness: CWE-312
Which versions are affected by CVE-2026-83551?
How do I fix CVE-2026-83551?
No fix has been published for CVE-2026-83551 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83551 being exploited?
There is no known exploitation of CVE-2026-83551 in the wild and no public exploit code.
Sources
Also known as GHSA-7xmc-crrw-fv5r.