# CVE-2026-89049: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-89049
- Priority: Urgent
- CVSS: n/a (critical)
- EPSS: 0.0066
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 30, 2026

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | amazon-ssm-agent amzn 2023 | 3.3.5226.0-1.amzn2023 | [ALAS2023-2026-3149](https://patchblox.com/security/data/fix/linux/alas2023-2026-3149.md) | Sep 30, 2026 |

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Data as of 2026-11-11T07:45:43Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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