High 7.8Published May 22, 2026

CVE-2026-9255Tool Execution Without Authorization via Piped Stdin in Kiro CLI

Updated under an hour ago (Oct 26, 2026, 1:30 PM ET)

Does this affect you?

It affects AWS Kiro CLI and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for AWS Kiro CLI

Exploited in the last 30 days

Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin. We recommend you to upgrade to kiro-cli version 1.28.0 or later.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Analyzed
Record last updated: May 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS Kiro CLI aws:kiro_cli (from the name)	before 1.28.0	CNA record
amazon kiro_cli amazon:kiro_cli	before 1.28.0	NVD

References

References

https://kiro.dev/changelog/cli/1-28/	release-notes
https://aws.amazon.com/security/security-bulletins/2026-035-aws/	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.