Is CVE-2026-4269 in the CISA KEV catalog?

No. CVE-2026-4269 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-4269?

CVE-2026-4269 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-4269?

CVE-2026-4269 has an EPSS score of 0.24% (15th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4269?

Upgrade bedrock agentcore starter toolkit to 0.1.13 or later.

CVE & CISA-KEV Catalog

CVE-2026-4269

HIGH

7.5

CVSS v3

NVD

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.

CWE-283 CWE-340

How to fix

Remediation Available

bedrock agentcore starter toolkitNVD

Affected:< 0.1.13Fixed in:0.1.13CVE-2026-4269derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.24%probability of exploitation in 30 days

15thpercentile

Low risk: more likely to be exploited than 15% of all known CVEs.

References

Vendor Advisory1

aws.amazon.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-283 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-8554	Medium	6.3	9.3%	-	Fix
CVE-2024-27903	Critical	9.8	8.9%	-	Fix
CVE-2021-24501	High	8.1	1.3%	-	Fix
CVE-2021-24500	High	8.1	0.6%	-	Fix
CVE-2025-1007	Medium	5.3	0.5%	-	Fix
CVE-2022-29220	Medium	6.5	0.5%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-11.