EUVD-2026-76157Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable but high complexity requiring adversary network positioning; no auth needed; availability-only impact, no C or I exposure.
Primary rating from Vendor (AMZN).
CVSS VectorVendor: AMZN
Lifecycle Timeline
9DescriptionCVE.org
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.
AnalysisAI
Process termination via unrecovered panic in AWS SDK for Go v2's EventStream header decoder allows a remote actor to crash any Go application consuming AWS streaming service responses. Sending a crafted EventStream response frame containing a header value type byte outside the valid range triggers an unhandled Go panic that propagates to terminate the host process. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concurrent conditions: (1) the target Go application must be using one of the affected AWS SDK for Go v2 packages to consume an EventStream-based AWS service - specifically services like Bedrock runtime inference, Bedrock agent runtime, or similar streaming APIs - and (2) the attacker must be able to control or interpose on the EventStream response delivered to the client, requiring a MITM position on the TLS session, DNS hijacking directing the client to a rogue endpoint, or direct control of a service endpoint the application trusts. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Two CVSS framings are on record and diverge considerably: NVD assigns CVSS 4.0 at 8.2 (VA:H, AT:P, AC:H), while the GHSA advisory rates it CVSS 3.1 Medium at 5.9 using vector AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - both confirmed, and the gap reflects methodological differences between scoring versions rather than a data error. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to the AWS SDK for Go v2 release tagged release-2026-03-23 or any later release, available at https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2026-03-23. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all Go applications in production that depend on AWS SDK for Go v2 and interact with Bedrock, streaming endpoints, or EventStream APIs. …
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External POC / Exploit Code
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