amazon-ssm-agent: A server-side request forgery issue due to improper validation of equivalent address representations in the port forw...
CVE-2026-89049 is fixed in amazon-ssm-agent on 1 platform by ALAS2023-2026-3149 (version 3.3.5226.0-1.amzn2023), released September 30, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
A server-side request forgery issue due to improper validation of equivalent address representations in the port forwarding to remote hosts functionality in Amazon AWS Systems Manager Agent (SSM Agent) before 3.3.4851.0 on all platforms might allow an authenticated remote user to bypass the remote destination denylist and reach link-local endpoints, potentially obtaining the temporary IAM role credentials of a managed instance and acting with that role's permissions from outside the instance, via a crafted destination host value that uses an alternate representation of a denied link-local address.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| amazon-ssm-agent · amzn 2023 | 3.3.5226.0-1.amzn2023 | ALAS2023-2026-3149 | Sep 30, 2026 |
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