{"cve":"CVE-2026-4269","nvd":{"published":"2026-03-16T18:16:11.007","modified":"2026-06-17T10:56:19.970","status":"Analyzed","description":"A missing S3 ownership verification in the Bedrock AgentCore Starter Toolkit before version v0.1.13 may allow a remote actor to inject code during the build process, leading to code execution in the AgentCore Runtime. This issue only affects users of the Bedrock AgentCore Starter Toolkit before version v0.1.13 who build or have built the Toolkit after September 24, 2025. Any users on a version >=v0.1.13, and any users on previous versions who built the toolkit before September 24, 2025 are not affected.\n\nTo remediate this issue, customers should upgrade to version v0.1.13.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H","score":5.8},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.5},"cwes":["CWE-283","CWE-340"],"references":["https://aws.amazon.com/security/security-bulletins/2026-008-AWS/","https://github.com/aws/bedrock-agentcore-starter-toolkit/releases/tag/v0.1.13"],"products":["amazon:bedrock_agentcore_starter_toolkit"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-4269","score":0.00252,"percentile":0.16709,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xfhr-q72q-jcrj","url":"https://osv.dev/vulnerability/GHSA-xfhr-q72q-jcrj","summary":"Improper S3 ownership verification in Bedrock AgentCore Starter Toolkit","modified":"2026-07-13T16:43:29.059247926Z","packages":[{"ecosystem":"PyPI","name":"bedrock-agentcore-starter-toolkit","purl":"pkg:pypi/bedrock-agentcore-starter-toolkit","ranges":["<0.1.13"],"fixed":["0.1.13"]}]},{"id":"PYSEC-2026-2396","url":"https://osv.dev/vulnerability/PYSEC-2026-2396","summary":"Improper S3 ownership verification in Bedrock AgentCore Starter Toolkit","modified":"2026-07-13T16:31:38.515142521Z","packages":[{"ecosystem":"PyPI","name":"bedrock-agentcore-starter-toolkit","purl":"pkg:pypi/bedrock-agentcore-starter-toolkit","ranges":["<0.1.13"],"fixed":["0.1.13"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}