CVE-2026-89090

Denial of service in the event stream header decoder in AWS SDK for Go v2

State: Published
Severity: 8.2 High
Published: Sep 11, 2026
Updated: Sep 24, 2026
Reserved: Sep 10, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	AMZN
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	AMZN

Weaknesses

CWE-248 Uncaught exception

Affected Products

Product	Versions
AWS SDK for Go v2AWS	before 2026-03-23Affected

References

https://github.com/aws/aws-sdk-go-v2/security/advisories/GHSA-xmrv-pmrh-hhx2third-party-advisory
https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2026-03-23patch
https://aws.amazon.com/security/security-bulletins/2026-110-aws/vendor-advisory

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