What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-31 · updated 2026-10-20
• Weakness: 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 products

• aws-c-event-stream: before 0.6.0 — fixed in 0.6.0

How to fix

Upgrade to a fixed version: aws-c-event-stream 0.6.0. Check the vendor advisory for mitigations.

References

• 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/security/advisories/GHSA-xvjw-fjq5-68hf

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