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

Moderate
Madrigal published GHSA-xmrv-pmrh-hhx2 Apr 7, 2026

Package

gomod github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream (Go)

Affected versions

< v1.7.8

Patched versions

v1.7.8
gomod github.com/aws/aws-sdk-go-v2/service/bedrockagentcore (Go)
< v1.15.2
v1.15.2
gomod github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime (Go)
< v1.51.8
v1.51.8
gomod github.com/aws/aws-sdk-go-v2/service/bedrockruntime (Go)
< v1.50.4
v1.50.4
gomod github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs (Go)
< v1.65.0
v1.65.0
gomod github.com/aws/aws-sdk-go-v2/service/iotsitewise (Go)
< v1.52.19
v1.52.19
gomod github.com/aws/aws-sdk-go-v2/service/kinesis (Go)
< v1.43.5
v1.43.5
gomod github.com/aws/aws-sdk-go-v2/service/lambda (Go)
< v1.88.5
v1.88.5
gomod github.com/aws/aws-sdk-go-v2/service/lexruntimev2 (Go)
< v1.35.15
v1.35.15
gomod github.com/aws/aws-sdk-go-v2/service/s3 (Go)
< v1.97.3
v1.97.3
gomod github.com/aws/aws-sdk-go-v2/service/sagemakerruntime (Go)
< v1.39.6
v1.39.6
gomod github.com/aws/aws-sdk-go-v2/service/transcribestreaming (Go)
< v1.34.5
v1.34.5

Description

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.

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE ID

No known CVE

Weaknesses

No CWEs
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