High 7.5Published Mar 31, 2026

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

Updated under an hour ago (Oct 27, 2026, 10:10 AM ET)

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It affects aws-c-event-stream. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for aws-c-event-stream

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS aws-c-event-stream aws:c_event_stream (from the name)	before 0.6.0	CNA record

References

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-fjq5-68hf	third-party-advisory
https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.