Arbitrary code execution via crafted project files in Kiro IDE

unknownCVE-2026-4295

Bulletin ID: 2026-009-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/03/17 12:15 PM PDT Description: Kiro is an AI-powered IDE for agentic software development. We identified CVE-2026-4295, where improper trust boundary enforcement allowed arbitrary code execution when a user opened a maliciously crafted project directory. Impacted versions: < 0.8.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CSIRTS triage

vendor: Kiro product: Kiro IDE Remote code executionOtheraffected: < 0.8.0

What: Improper trust boundary enforcement allows arbitrary code execution when a user opens a maliciously crafted project directory.
Who is affected: Users of Kiro IDE versions before 0.8.0.
Urgency: Remediation is urgent due to the risk of arbitrary code execution.
Action: Upgrade to Kiro IDE version 0.8.0 or later.

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: 2026-08-20
Exploitation: Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-009-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-2026-42950.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-4295	coverage & exploitation status	NVD · CVE.org

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