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Vulnerability record · CVE-2026-5190 · published 31 March 2026

CVE-2026-5190: Out-of-bounds write vulnerability

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.

7.7 CVSS 4.0 High EPSS 0.53% · top 57.4% CWE-787 · Out-of-bounds write Awaiting Analysis
7.7CVSS 4.0 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
24 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-5190), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.