Denial of Service due to Panic in AWS SDK for Go v2 SDK EventStream Decoder

Overview

CVSSv3.1 Rating: [Medium] CVSSv3.1 Score: [5.9] CVSSv3.1 Vector String: [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H]

Summary and Impact

An issue exists in the the EventStream header decoder in AWS SDK for Go v2 in versions predating 2026-03-23. An actor can send a malformed EventStream response frame containing a crafted header value type byte outside the valid range, which can cause the host process to terminate.

Impacted versions: < 2026-03-23

Patches

This issue has been addressed in versions 2026-03-23 and above. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds

Not Applicable

References

If you have any questions or comments about this advisory, we ask that you contact [AWS/Amazon] Security via our vulnerability reporting page or directly via email to [email protected]. Please do not create a public GitHub issue.

Affected packages

• github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream < 1.7.8
• github.com/aws/aws-sdk-go-v2/service/bedrockagentcore < 1.15.2
• github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime < 1.51.8
• github.com/aws/aws-sdk-go-v2/service/bedrockruntime < 1.50.4
• github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs < 1.65.0
• github.com/aws/aws-sdk-go-v2/service/iotsitewise < 1.52.19
• github.com/aws/aws-sdk-go-v2/service/kinesis < 1.43.5
• github.com/aws/aws-sdk-go-v2/service/lambda < 1.88.5
• github.com/aws/aws-sdk-go-v2/service/lexruntimev2 < 1.35.15
• github.com/aws/aws-sdk-go-v2/service/s3 < 1.97.3
• github.com/aws/aws-sdk-go-v2/service/sagemakerruntime < 1.39.6
• github.com/aws/aws-sdk-go-v2/service/transcribestreaming < 1.34.5

Remediation

Upgrade to a patched release:

• github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream 1.7.8
• github.com/aws/aws-sdk-go-v2/service/bedrockagentcore 1.15.2
• github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime 1.51.8
• github.com/aws/aws-sdk-go-v2/service/bedrockruntime 1.50.4
• github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs 1.65.0
• github.com/aws/aws-sdk-go-v2/service/iotsitewise 1.52.19
• github.com/aws/aws-sdk-go-v2/service/kinesis 1.43.5
• github.com/aws/aws-sdk-go-v2/service/lambda 1.88.5
• github.com/aws/aws-sdk-go-v2/service/lexruntimev2 1.35.15
• github.com/aws/aws-sdk-go-v2/service/s3 1.97.3
• github.com/aws/aws-sdk-go-v2/service/sagemakerruntime 1.39.6
• github.com/aws/aws-sdk-go-v2/service/transcribestreaming 1.34.5