Vulnerability · Published Sep 11, 2026 · Assigned by AMZN
CVE-2026-89090Denial of service in the event stream header decoder in AWS SDK for Go v2
Medium 5.9
In plain English
A medium-severity security flaw in AWS SDK for Go v2 from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream | 1.7.8 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream | 1.7.8 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/bedrockagentcore | 1.15.2 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/bedrockagentcore | 1.15.2 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime | 1.51.8 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime | 1.51.8 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/bedrockruntime | 1.50.4 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/bedrockruntime | 1.50.4 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs | 1.65.0 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs | 1.65.0 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/iotsitewise | 1.52.19 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/iotsitewise | 1.52.19 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/kinesis | 1.43.5 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/kinesis | 1.43.5 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/lambda | 1.88.5 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/lambda | 1.88.5 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/lexruntimev2 | 1.35.15 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/lexruntimev2 | 1.35.15 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/s3 | 1.97.3 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/s3 | 1.97.3 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/sagemakerruntime | 1.39.6 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/sagemakerruntime | 1.39.6 | GHSA-xmrv-pmrh-hhx2 |
| Go | github.com/aws/aws-sdk-go-v2/service/transcribestreaming | 1.34.5 | GO-2026-5764 |
| Go | github.com/aws/aws-sdk-go-v2/service/transcribestreaming | 1.34.5 | GHSA-xmrv-pmrh-hhx2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AWS | AWS SDK for Go v2 | 0 – before 2026-03-23 |
Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H