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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://aws.amazon.com/security/security-bulletins/2026-011-aws/
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/awslabs/aws-c-event-stream/releases/tag/v0.6.0
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq…
ff89ba41-3aa1-4d27-914a-91399e9639e5