High severity · published Mar 31, 2026
CVE-2026-5190
AWS C Event Stream Streaming Decoder Stack Buffer Overflow
7.5
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AW
aws-c-event-stream · AWS
before 0.6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5190
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5190
aws.amazon.com
https://aws.amazon.com/security/security-bulletins/2026-011-aws/
github.com
https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0
github.com
https://github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq5-68hf