CVE-2026-9255: Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local atta

Q: How do I fix CVE-2026-9255?

kiro cli: upgrade to 1.28.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-9255 being exploited?

CVE-2026-9255 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-9255 affect?

CVE-2026-9255 affects kiro cli. Severity is high (CVSS 7.8). 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

Q: How urgent is CVE-2026-9255?

Priority 33/100. High severity; On your watchlist

Routine

HIGH 7.8WATCHLISTUPGRADE

CVE-2026-9255 is a high-severity flaw (CVSS 7.8) affecting kiro cli. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-05-22
Last modified	2026-07-23

Publisher (CNA): AMZN · Vendor: amazon

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-22 17:16 UTCPublished CVE record published
2026-07-23 16:10 UTCUpdated Record last modified

amazon kiro cli UPGRADE

Affected: < 1.28.0

Fixed in: 1.28.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kiro-cli || rpm -q kiro-cli || kiro-cli --version

2. UPGRADE to 1.28.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kiro-cli

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kiro-cli

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-9255?

kiro cli: upgrade to 1.28.0. Exact commands for each OS are on this page.

Is CVE-2026-9255 being exploited?

CVE-2026-9255 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-9255 affect?

CVE-2026-9255 affects kiro cli. Severity is high (CVSS 7.8). 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

How urgent is CVE-2026-9255?

Priority 33/100. High severity; On your watchlist

Related CVEs

CVE-2026-18657 HIGH 7.8 UPGRADE An uncontrolled search path element in Kiro CLI before version 2.10.0 on Windows might allow a remote unauthen

References

← Back to latest CVEs