CVE-2026-89090
Description
A flaw was found in the event stream header decoder of the Amazon AWS SDK for Go v2. An unauthenticated remote attacker could exploit this vulnerability by sending a specially crafted event stream response frame. This frame, containing a header value type outside the valid range, would cause an unrecovered panic, leading to the termination of the consuming application process and resulting in a Denial of Service (DoS).
Statement
A flaw in AWS SDK for Go v2 can cause an application to terminate when it processes an attacker-controlled EventStream response with a crafted header.
Mitigation
Upgrade affected AWS SDK for Go v2 modules to the fixed releases published after 2026-03-23. There is no documented workaround.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | N/A | 5.9 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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