CVE-2026-89049

Summary

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.

Affected Software

VendorProductVersion RangeStatus
AWSAmazon SSM Agent0 < 3.3.4851.0affected

Weaknesses

  • CWE-918: CWE-918 Server-Side request forgery (SSRF)
  • CWE-1289: CWE-1289 Improper validation of unsafe equivalence in input

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References