# CVE-2026-5190: AWS C Event Stream Streaming Decoder Stack Buffer Overflow

> CVE-2026-5190: AWS C Event Stream Streaming Decoder Stack Buffer Overflow. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-5190
Last updated: 2026-10-20T19:17:38Z

- Published: 2026-03-31 17:05 UTC · Updated: 2026-10-20 19:17 UTC · Assigner: AMZN
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 0.41%, 35th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-787

## Description

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 vendors and products

- AWS: aws-c-event-stream

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-5190)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-5190)
- [https://aws.amazon.com/security/security-bulletins/2026-011-aws/](https://aws.amazon.com/security/security-bulletins/2026-011-aws/)
- [https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0](https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0)
- [https://github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq5-68hf](https://github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq5-68hf)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-5190 · Markdown: https://rewindex.com/cve/CVE-2026-5190.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-5190 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:11:22.955Z