Denial of service in the event stream header decoder in AWS SDK for Go v2 (CVE-2026-89090) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89090

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

Answer in brief

CVE-2026-89090 records a Unknown severity vulnerability in Denial of service in the event stream header decoder in AWS SDK for Go v2. The current sources do not mark it as known exploited. The current feed maps AWS/AWS SDK for Go v2 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AWS/AWS SDK for Go v2 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
AWS/AWS SDK for Go v2generic	>=0 <2026-03-23	2026-03-23

Recommended response

Check inventory. Check lockfiles and deployed manifests for AWS/AWS SDK for Go v2.
Review the reported fix. Update AWS/AWS SDK for Go v2 to 2026-03-23 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.