CVE-2026-9255

Tool Execution Without Authorization via Piped Stdin in Kiro CLI

CVSS 8.4 HIGHEPSS 0.1%CWE-862

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.4EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

22 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

AWS · Kiro CLI

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References

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