CVE•Published 2026-03-16•Modified 2026-05-11•0 articles on news•5 live references•NVD data

CVE-2026-4269Amazon · Bedrock_agentcore_starter_toolkit

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 83% of all CVEs

Weaknesses (CWE)

CWE-283Unverified Ownership CWE-340Generation of Predictable Numbers or Identifiers

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. To remediate this issue, customers should upgrade to version v0.1.13.

Timeline

Published 2026-03-16

Modified 2026-05-11

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-4269

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Amazon Bedrock Agentcore Starter Toolkit"

All exposed Amazon Bedrock Agentcore Starter Toolkit instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Bedrock Agentcore Starter Toolkit"

HTTP body or banner mentions "Bedrock Agentcore Starter Toolkit" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-4269