CVE-2026-18656 & CVE-2026-18657 - Issue with Kiro IDE and CLI - Executable Resolution from Untrusted Project Directory on Windows

unknownCVE-2026-18656 CVE-2026-18657

Bulletin ID: 2026-074-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/04/2026 12:30 PM PDT Description: Kiro is an agentic IDE and command-line interface users install on their desktop. We identified CVE-2026-18656 and CVE-2026-18657, an issue where an uncontrolled search path element on Windows might allow an actor to execute arbitrary code via a maliciously crafted project directory containing a planted executable that is resolved before the system PATH when a local user opens the directory. Impacted versions: - Kiro IDE for Windows between versions 1.0.0 through 1.0.212 - Kiro CLI for Windows prior to v2.10.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CSIRTS triage

vendor: AWS product: Kiro IDE, Kiro CLI Remote code execution Code injectionaffected: Kiro IDE for Windows 1.0.0 through 1.0.212; Kiro CLI for Windows prior to v2.10.0

What: Uncontrolled search path element on Windows allows arbitrary code execution via malicious executable in project directory.
Who is affected: Windows users of Kiro IDE (1.0.0-1.0.212) and Kiro CLI (prior to 2.10.0) opening untrusted project directories.
Urgency: Critical; local arbitrary code execution via directory traversal is exploitable if user opens malicious project.
Action: Update Kiro IDE to version after 1.0.212 and Kiro CLI to v2.10.0 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/2026-074-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-2026-186560.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-186570.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-18656	coverage & exploitation status	NVD · CVE.org
CVE-2026-18657	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for & CVE-2026-18657 -

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-18657: An uncontrolled search path element in Kiro CLI before version 2.10.0 on Windows might allow a…nvd · 2026-08-04