CVE-2026-8596

HIGHNVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.2 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Cleartext storage of sensitive information in the ModelBuilder/Serve component in Amazon SageMaker Python SDK before v2.257.2 and v3 before v3.8.0 might allow a remote authenticated actor to extract the HMAC signing key from SageMaker API responses and forge valid integrity signatures for specially crafted model artifacts, achieving code execution in inference containers. This issue requires a remote authenticated actor with permissions to call SageMaker describe APIs and S3 write access to the model artifact path.

To remediate this issue, we recommend upgrading to Amazon SageMaker Python SDK v2.257.2 or v3.8.0 and rebuild any models previously created with ModelBuilder using the updated SDK.

CVSS v3
7.2
EG Score
7.2HIGHmedium confidence
EG Risk
33
EG Risk 33/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity72% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
Not listed

Published

May 14, 2026

Last Modified

May 15, 2026

Advisory Details (4)

Auto-updated May 15, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path · Advisory · aws/sagemaker-python-sdk · GitHub

https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5
generic

Release v3.8.0 (2026-04-16) · aws/sagemaker-python-sdk · GitHub

https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0
generic

Release Release v2.257.2 · aws/sagemaker-python-sdk · GitHub

https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2
generic

CVE-2026-8596 and CVE-2026-8597: Issue with Amazon SageMaker Python SDK - Model artifact integrity verification issues

https://aws.amazon.com/security/security-bulletins/2026-031-aws/

Vendor Advisories for CVE-2026-8596(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
sagemaker2.199.0 ... 3.7.1 (114 versions)
  • 2.199.0 up to 2.257.2: fixed in 2.257.2
  • 3.0.0 up to 3.8.0: fixed in 3.8.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 163 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2026-8596?
CVE-2026-8596 is a high vulnerability published on May 14, 2026. Cleartext storage of sensitive information in the ModelBuilder/Serve component in Amazon SageMaker Python SDK before v2.257.2 and v3 before v3.8.0 might allow a remote authenticated actor to extract the HMAC signing key from SageMaker API responses and forge valid integrity signatures for specially…
When was CVE-2026-8596 disclosed?
CVE-2026-8596 was first published on May 14, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8596 actively exploited?
CVE-2026-8596 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8596?
CVE-2026-8596 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-8596?
A fix for CVE-2026-8596 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-8596 are linked in the Vendor Advisories panel on this page.

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