CVE-2026-5190

AWS C Event Stream Streaming Decoder Stack Buffer Overflow

State: Published
Severity: 7.7 High
Published: Mar 31, 2026
Updated: Oct 20, 2026
Reserved: Mar 30, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	AMZN
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	AMZN

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
aws-c-event-streamAWS	before 0.6.0Affected

References

https://aws.amazon.com/security/security-bulletins/2026-011-aws/vendor-advisory
https://github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq5-68hfthird-party-advisory
https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0patch

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