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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://aws.amazon.com/security/security-bulletins/2026-110-aws/
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2026-03-23
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/aws/aws-sdk-go-v2/security/advisories/GHSA-xmrv-pmrh-hhx2
ff89ba41-3aa1-4d27-914a-91399e9639e5