Vulnerability · Published Mar 31, 2026 · Assigned by AMZN
CVE-2026-5190AWS C Event Stream Streaming Decoder Stack Buffer Overflow
High 7.5
In plain English
A high-severity out-of-bounds write in aws-c-event-stream from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 63.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AWS | aws-c-event-stream | 0 – before 0.6.0 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H