CVE-2026-9291 - Insecure Deserialization in Amazon Braket SDK Job Results Processing

unknownCVE-2026-9291

Bulletin ID: 2026-036-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 05/22/2026 11:15 AM PDT Description: Amazon Braket SDK is an open-source Python library for interacting with the Amazon Braket quantum computing service, including managing hybrid quantum jobs and retrieving job results. We identified CVE-2026-9291, an insecure deserialization issue (CWE-502) in the job results processing component. The SDK's deserialize_values() function trusts the dataFormat field from an untrusted JSON file to control whether pickle.loads() is called on the data payload. A remote authenticated user with S3 write access to the job output bucket can modify the dataFormat field in results.json from PLAINTEXT to pickled_v4 and replace data values with executable payloads, achieving arbitrary code execution on any machine that processes job results. Impacted versions: >= 1.10.0 AND < 1.117.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CSIRTS triage

vendor: Amazon product: Amazon Braket SDK Unsafe deserialization Remote code executionaffected: >= 1.1

What: Insecure deserialization allows remote authenticated users to execute arbitrary code.
Who is affected: Authenticated users with S3 write access to the job output bucket in Amazon Braket SDK.
Urgency: Remediation is critical as it can lead to remote code execution.
Action: Upgrade to the latest version of Amazon Braket SDK.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: AWS Security Bulletins (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-06-05
Exploitation: Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-036-aws/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-92910.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-9291	coverage & exploitation status	NVD · CVE.org

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