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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.9 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

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 aws-security@amazon.com. Please do not create a public GitHub issue.

Published by the source

8 Apr 2026, 00:18 UTC

Last modified by the source

8 Apr 2026, 00:18 UTC

Source last checked

26 Oct 2026, 15:19 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-xmrv-pmrh-hhx2

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# Patch Next advisory brief: GHSA-xmrv-pmrh-hhx2

Advisory: Denial of Service due to Panic in AWS SDK for Go v2 SDK EventStream Decoder
IDs: GHSA-xmrv-pmrh-hhx2
Record: https://patchnext.com/advisories/ghsa-xmrv-pmrh-hhx2 (revision 1, source checked 26 Oct 2026, 15:19 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream 1.7.8; github.com/aws/aws-sdk-go-v2/service/lambda 1.88.5; github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime 1.51.8; github.com/aws/aws-sdk-go-v2/service/bedrockagentcore 1.15.2; github.com/aws/aws-sdk-go-v2/service/lexruntimev2 1.35.15; 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/kinesis 1.43.5; github.com/aws/aws-sdk-go-v2/service/iotsitewise 1.52.19; github.com/aws/aws-sdk-go-v2/service/transcribestreaming 1.34.5; github.com/aws/aws-sdk-go-v2/service/sagemakerruntime 1.39.6; github.com/aws/aws-sdk-go-v2/service/s3 1.97.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream: affected < 1.7.8; fixed in 1.7.8
- Go github.com/aws/aws-sdk-go-v2/service/lambda: affected < 1.88.5; fixed in 1.88.5
- Go github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime: affected < 1.51.8; fixed in 1.51.8
- Go github.com/aws/aws-sdk-go-v2/service/bedrockagentcore: affected < 1.15.2; fixed in 1.15.2
- Go github.com/aws/aws-sdk-go-v2/service/lexruntimev2: affected < 1.35.15; fixed in 1.35.15
- Go github.com/aws/aws-sdk-go-v2/service/bedrockruntime: affected < 1.50.4; fixed in 1.50.4
- Go github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs: affected < 1.65.0; fixed in 1.65.0
- Go github.com/aws/aws-sdk-go-v2/service/kinesis: affected < 1.43.5; fixed in 1.43.5
- Go github.com/aws/aws-sdk-go-v2/service/iotsitewise: affected < 1.52.19; fixed in 1.52.19
- Go github.com/aws/aws-sdk-go-v2/service/transcribestreaming: affected < 1.34.5; fixed in 1.34.5
- Go github.com/aws/aws-sdk-go-v2/service/sagemakerruntime: affected < 1.39.6; fixed in 1.39.6
- Go github.com/aws/aws-sdk-go-v2/service/s3: affected < 1.97.3; fixed in 1.97.3

## Suggested inspection (read-only)
- Go github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/lambda: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/bedrockagentcore: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/lexruntimev2: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/bedrockruntime: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/kinesis: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/iotsitewise: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/transcribestreaming: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/sagemakerruntime: check the installed version with your package manager.
- Go github.com/aws/aws-sdk-go-v2/service/s3: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream, github.com/aws/aws-sdk-go-v2/service/lambda, github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime, github.com/aws/aws-sdk-go-v2/service/bedrockagentcore, github.com/aws/aws-sdk-go-v2/service/lexruntimev2, github.com/aws/aws-sdk-go-v2/service/bedrockruntime, github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs, github.com/aws/aws-sdk-go-v2/service/kinesis, github.com/aws/aws-sdk-go-v2/service/iotsitewise, github.com/aws/aws-sdk-go-v2/service/transcribestreaming, github.com/aws/aws-sdk-go-v2/service/sagemakerruntime, github.com/aws/aws-sdk-go-v2/service/s3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-xmrv-pmrh-hhx2 (GitHub-reviewed advisory GHSA-xmrv-pmrh-hhx2 lists affected ranges: Go github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream >=0 =0 =0 =0 =0 =0 <1.52.19; Go…)

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