CVE-2026-89090

Summary

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.

Affected Software

Weaknesses

• CWE-248: CWE-248 Uncaught exception

ADP Enrichment

CISA ADP Vulnrichment

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

References

• https://github.com/aws/aws-sdk-go-v2/security/advisories/GHSA-xmrv-pmrh-hhx2
• https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2026-03-23
• https://aws.amazon.com/security/security-bulletins/2026-110-aws/

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