GHSA-xmrv-pmrh-hhx2 — eventstream
MEDIUMGHSA-xmrv-pmrh-hhx2 is a medium-severity (CVSS 5.9) CWE-248 vulnerability in github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream. A fix is available for github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream — see the affected versions and patch details below.
Denial of Service due to Panic in AWS SDK for Go v2 SDK EventStream Decoder
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-xmrv-pmrh-hhx2.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-xmrv-pmrh-hhx2 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream🐹github.com/aws/aws-sdk-go-v2/service/bedrockagentcore🐹github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime🐹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/iotsitewise🐹github.com/aws/aws-sdk-go-v2/service/kinesis🐹github.com/aws/aws-sdk-go-v2/service/lambda+4 moreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
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 [email protected]. Please do not create a public GitHub issue.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream | all versions | 1.7.8go get github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream@v1.7.8 |
| 🐹Go | github.com/aws/aws-sdk-go-v2/service/bedrockagentcore | all versions | 1.15.2go get github.com/aws/aws-sdk-go-v2/service/bedrockagentcore@v1.15.2 |
| 🐹Go | github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime | all versions | 1.51.8go get github.com/aws/aws-sdk-go-v2/service/bedrockagentruntime@v1.51.8 |
| 🐹Go | github.com/aws/aws-sdk-go-v2/service/bedrockruntime | all versions | 1.50.4go get github.com/aws/aws-sdk-go-v2/service/bedrockruntime@v1.50.4 |
| 🐹Go | github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs | all versions | 1.65.0go get github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs@v1.65.0 |
| 🐹Go | github.com/aws/aws-sdk-go-v2/service/iotsitewise | all versions | 1.52.19go get github.com/aws/aws-sdk-go-v2/service/iotsitewise@v1.52.19 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream to 1.7.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xmrv-pmrh-hhx2 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-xmrv-pmrh-hhx2 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-xmrv-pmrh-hhx2. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-xmrv-pmrh-hhx2 in your dependencies?
O3 Security finds GHSA-xmrv-pmrh-hhx2 across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.