EUVD-2026-17575
CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
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.
Analysis
Memory corruption leading to arbitrary code execution affects AWS C Event Stream library versions before 0.6.0 when clients process malicious event-stream messages from attacker-controlled servers. The out-of-bounds write vulnerability in the streaming decoder requires high attack complexity and user interaction (CVSS:3.1/AV:N/AC:H/PR:N/UI:R), but grants complete control over confidentiality, integrity, and availability if successfully exploited. …
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Remediation
Within 24 hours: Inventory all applications and services using AWS C Event Stream library and identify current versions in production. Within 7 days: Test and deploy AWS C Event Stream library version 0.6.0 or later across all affected systems; prioritize client-facing applications that process external event-stream messages. …
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External POC / Exploit Code
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