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CVE-2026-89049

Server-side request forgery in the Session Manager port forwarding functionality in AWS Systems Manager Agent

CVSS 3.1 9.9 CRITICALCVSS 4.0 8.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-89049

Published

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. To remediate this issue, users should upgrade to version 3.3.4851.0 or later.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-89049

Published

Amazon SSM Agent

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "AWS",
                    "product": "Amazon SSM Agent",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "3.3.4851.0",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON