Is CVE-2026-89090 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-89090?

CVE-2026-89090 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-89090

Description

An unrecovered panic in the event stream header decoder in Amazon AWS SDK for Go v2 before release-2026-03-23 might allow an unauthenticated remote actor to terminate the consuming application process via a crafted event stream response frame containing a header value type outside the valid range. To remediate this issue, users should upgrade to release-2026-03-23 or later, and patch any forked or derivative code.