CVE-2026-112408
CRITICAL 9.4Missing verification of source of a communication channel in the default_bucket() function in Amazon SageMaker Python SDK V3 before 3.10.0 and V2 before 2.257.3 might allow remote actors to achieve code execution in the target SageMaker execution environment and obtain IAM credentials via pre-creation of a predictably named S3 bucket that the SDK uses without ownership validation. To remediate this issue, users should upgrade to Amazon SageMaker Python SDK 3.10.0 (V3) or 2.257.3 (V2).
Severe if exploited (CVSS 9.4), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.7%chance of exploitation in 30 days · 54th percentile
Impact if exploited
9.4CVSS 4.0 · CRITICAL
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ⚠Requirements: Specific conditions must be present
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-940: Improper verification of source of a communication channel
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N
References and research data (JSON)
All CVSS metrics
- HIGH 8.1 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CRITICAL 9.4 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N - CRITICAL 9.4 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - HIGH 8.1 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Patches & mitigations
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.3 CVE record · AMZN · Updated 2026-10-21T19:47:47.503Z
NVD · CVE-2026-112408 · Updated 2026-10-22T17:21:57.293 - https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.10.0 CVE record · AMZN · Updated 2026-10-21T19:47:47.503Z
NVD · CVE-2026-112408 · Updated 2026-10-22T17:21:57.293 - https://pypi.org/project/sagemaker/3.10.0/ CVE record · AMZN · Updated 2026-10-21T19:47:47.503Z
NVD · CVE-2026-112408 · Updated 2026-10-22T17:21:57.293 - https://pypi.org/project/sagemaker/2.257.3/ CVE record · AMZN · Updated 2026-10-21T19:47:47.503Z
NVD · CVE-2026-112408 · Updated 2026-10-22T17:21:57.293
Advisories
- https://aws.amazon.com/security/security-bulletins/2026-142-aws/ CVE record · AMZN · Updated 2026-10-21T19:47:47.503Z
NVD · CVE-2026-112408 · Updated 2026-10-22T17:21:57.293 - https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-5rx8-8fr2-f855 CVE record · AMZN · Updated 2026-10-21T19:47:47.503Z
NVD · CVE-2026-112408 · Updated 2026-10-22T17:21:57.293 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-107541 EUVD · EUVD-2026-107541