SSM Agent is widely deployed across AWS managed instances; this SSRF can exfiltrate temporary IAM credentials enabling lateral access — high-impact for many organizations.
CVE-2026-89049
SSM Agent SSRF can steal instance IAM credentials via link-local bypass
Is CVE-2026-89049 being exploited?
Not confirmed. CVE-2026-89049 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-89049?
CVE-2026-89049 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-89049?
Yes. A fix has been recorded for CVE-2026-89049. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-89049 affect?
CVE-2026-89049 affects Amazon SSM Agent <3.3.4851.0 (all platforms), Managed instances (EC2, on-prem with SSM). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-89049?
Upgrade SSM Agent to 3.3.4851.0+; audit and rotate affected IAM roles/credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can bypass denylist, access link-local metadata, exfiltrate temporary IAM role credentials and act with those permissions remotely.
Immediate action required
- affected< 3.3.4851.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.