# 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.

- **Severity:** High 8.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Sep 2026
- **Updated:** 1 Sep 2026
- **Also known as:** GHSA-7xmc-crrw-fv5r

## 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 (Cleartext Storage of Sensitive Information)

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-83551 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-83551 in the wild and no public exploit code.

Affected product: AWS sagemaker-python-sdk. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-83551/ (Markdown: https://insights.sbomify.com/CVE-2026-83551/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-83551
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-83551
- OSV: https://osv.dev/vulnerability/CVE-2026-83551

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-83551/
Summaries are generated and may contain mistakes; the official description above is the record.