---
id: CVE-2026-5190
title: AWS C Event Stream Streaming Decoder Stack Buffer Overflow
summary: >-
  Out-of-bounds write in the streaming decoder component in aws-c-event-stream
  before 0.6.0 might allow a third party operating a server to cause memory
  corruption leading to arbitrary code execution on a client application that
  processes …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: AWS
product: aws-c-event-stream
affected:
  - aws-c-event-stream < 0.6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-03-31T00:00:00+00:00'
published: '2026-03-31'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T18:16:59.122Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-5190'
references:
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-011-aws/'
  - url: >-
      https://github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq5-68hf
  - url: 'https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0'
tags:
  - cve.org
epss: 0.00531
epssPercentile: 0.43755
ingestedAt: '2026-10-20T19:16:14.555Z'
---

## Overview

Out-of-bounds write in the streaming decoder component in aws-c-event-stream before 0.6.0 might allow a third party operating a server to cause memory corruption leading to arbitrary code execution on a client application that processes crafted event-stream messages.



To remediate this issue, users should upgrade to version 0.6.0 or later.

## Affected

- `aws-c-event-stream < 0.6.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.