What is CVE-2026-5190?

CVE-2026-5190 is a high-severity vulnerability in Aws Aws-c-event-stream, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-03-31.

How severe is CVE-2026-5190?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Aws Aws-c-event-stream

CVE-2026-5190

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 cr…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (6.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Aws Aws-c-event-stream — versions 0.6.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-5190?: CVE-2026-5190 is a high-severity vulnerability in Aws Aws-c-event-stream, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-03-31.
How severe is CVE-2026-5190?: High severity. CVSS v3 base score is 7.5 out of 10.