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VULNERABILITIES

CVE-2026-89049 Details

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

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: AMZNCVSS-B:9.9 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-107-aws/ AMZN
https://github.com/aws/amazon-ssm-agent/releases/tag/3.3.4851.0 AMZN
https://github.com/aws/amazon-ssm-agent/security/advisories/GHSA-w9jw-h72g-6hxc AMZN

Weakness Enumeration

CWE-IDCWE NameSource
CWE-1289Improper Validation of Unsafe Equivalence in InputAMZN
CWE-918Server-Side Request Forgery (SSRF)AMZN

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-89049
NVD Published Date:
Sep 10, 2026
NVD Last Modified:
Sep 10, 2026
Source:
AMZN
CVE-2026-89049 Details - Not Deferred