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CVE-2026-4269

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 a
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3091c33263b1229ba28f1343268e0a53f494b7bcc331a8d516e94d47602fe574
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.8,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImp…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/metrics/0/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-283","description":"CWE-283 Unverified Ownership","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-340","description":"CWE-340 Generation of Predictable Numbers or Identifiers","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Bedrock AgentCore Starter Toolkit","vendor":"AWS","versions":[{"lessThan":"0.1.13","status":"affected","version":"0.1.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.8,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImp…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-283","description":"CWE-283 Unverified Ownership","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-340","description":"CWE-340 Generation of Predictable Numbers or Identifiers","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["vendor-advisory"],"url":"https://aws.amazon.com/security/security-bulletins/2026-008-AWS/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/aws/bedrock-agentcore-starter-toolkit/releases/tag/v0.1.13"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6fecc4e183ffea3560d46cf57bf49e227ae03c915cc4e48f941896dd219b4277 · sha256:99fb498079fcc535… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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