How severe is CVE-2026-18657?

CVE-2026-18657 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-18657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-18657?

CVE-2026-18657 affects Amazon Kiro Cli. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-18657?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-18657 published?

CVE-2026-18657 was published on 2026-08-04 and last updated on 2026-08-18.

CVE-2026-18657

CVE-2026-18657 is a high-severity vulnerability in Amazon Kiro Cli with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-427.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.5
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-427
Affected product: Amazon Kiro Cli
Published: 2026-08-04
Last modified: 2026-08-18

Description

An uncontrolled search path element in Kiro CLI before version 2.10.0 on Windows might allow a remote unauthenticated actor to execute arbitrary code via a maliciously crafted project directory containing an executable that bypasses workspace trust protections when a local user starts Kiro CLI in the directory. To remediate this issue, users should upgrade to version 2.10.0 or higher.

Frequently asked questions

What is CVE-2026-18657?: An uncontrolled search path element in Kiro CLI before version 2.10.0 on Windows might allow a remote unauthenticated actor to execute arbitrary code via a maliciously crafted project directory containing an executable that bypasses workspace trust protections when a local user starts Kiro CLI in the directory. To remediate this issue, users should upgrade to version 2.10.0 or higher.
How severe is CVE-2026-18657?: CVE-2026-18657 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-18657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-18657?: CVE-2026-18657 affects Amazon Kiro Cli. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-18657?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-18657 published?: CVE-2026-18657 was published on 2026-08-04 and last updated on 2026-08-18.

References

Affected products (1)

cpe:2.3:a:amazon:kiro_cli:*:*:*:*:*:*:*:*

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