CVE-2026-18657
Uncontrolled search path in Kiro CLI allows arbitrary code execution from malicious project folders.
Is CVE-2026-18657 being exploited?
Not confirmed. CVE-2026-18657 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.17% probability of exploitation in the next 30 days.
How severe is CVE-2026-18657?
CVE-2026-18657 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-18657?
Yes. A fix has been recorded for CVE-2026-18657. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-18657 affect?
CVE-2026-18657 affects Kiro CLI < 2.10.0 on Windows, Windows developer workstations. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18657?
Upgrade Kiro CLI to >=2.10.0 and avoid running CLI in untrusted project directories.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-supplied executable in a project directory can be executed when a user starts Kiro CLI on Windows, enabling arbitrary code execution and local compromise.
Patch when possible
- affected< 2.10.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.