CVE-2025-3857 HIGH

CVE-2025-3857: Infinite loop condition in Amazon.IonDotnet

Vendor Amazon
Product Amazon Ion Dotnet
Weakness CWE-835
Published April 21, 2025
Last update October 14, 2025

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

When reading binary Ion data through Amazon.IonDotnet using the RawBinaryReader class, Amazon.IonDotnet does not check the number of bytes read from the underlying stream while deserializing the binary format. If the Ion data is malformed or truncated, this triggers an infinite loop condition that could potentially result in a denial of service. Users should upgrade to Amazon.IonDotnet version 1.3.1 and ensure any forked or derivative code is patched to incorporate the new fixes.

Key dates

02Disclosure timeline

April 21, 2025 CVE published
October 14, 2025 Record updated