Medium 5.9Published Sep 11, 2026

CVE-2026-89090Denial of service in the event stream header decoder in AWS SDK for Go v2

Updated under an hour ago (2026-10-19 07:00 UTC)

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It affects AWS SDK for Go v2. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for AWS SDK for Go v2

Exploited in the last 30 days

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.

CVSS: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-248
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS AWS SDK for Go v2 aws:sdk_for_go_v2 (from the name)	before 2026-03-23	CNA record

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.