{"id":"CVE-2026-5190","title":"AWS C Event Stream Streaming Decoder Stack Buffer Overflow","summary":"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 …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-787"],"vendor":"AWS","product":"aws-c-event-stream","affected":["aws-c-event-stream < 0.6.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-03-31T00:00:00+00:00"},"published":"2026-03-31","updated":"2026-10-20","sourceUpdated":"2026-10-20T18:16:59.122Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-5190","references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-011-aws/"},{"url":"https://github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq5-68hf"},{"url":"https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0"}],"tags":["cve.org"],"epss":0.00531,"epssPercentile":0.43755,"ingestedAt":"2026-10-20T19:16:14.555Z","slug":"CVE-2026-5190","body":"## Overview\n\nOut-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.\n\n\n\nTo remediate this issue, users should upgrade to version 0.6.0 or later.\n\n## Affected\n\n- `aws-c-event-stream < 0.6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}