Out-of-bounds write in AWS aws-c-event-stream v<0.6.0 streaming decoder
CVE-2026-5190 Published on March 31, 2026
AWS C Event Stream Streaming Decoder Stack Buffer Overflow
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.
Vulnerability Analysis
CVE-2026-5190 is exploitable with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-5190 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-5190
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Affected Versions
aws-c-event-stream Version 0.6.0 is unaffected by CVE-2026-5190Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.