CVE-2025-3857

Infinite loop condition in Amazon.IonDotnet

Description

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.

Category

8.7
CVSS
Severity: High
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.05%
Vendor Advisory amazon.com
Affected: Amazon Amazon Ion Dotnet
Published at:
Updated at:

References

Link Tags
https://aws.amazon.com/security/security-bulletins/AWS-2025-009/ vendor advisory
https://github.com/amazon-ion/ion-dotnet/security/advisories/GHSA-gm2p-wf5c-w3pj third party advisory

Frequently Asked Questions

What is the severity of CVE-2025-3857?
CVE-2025-3857 has been scored as a high severity vulnerability.
How to fix CVE-2025-3857?
To fix CVE-2025-3857, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-3857 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-3857 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-3857?
CVE-2025-3857 affects Amazon Amazon Ion Dotnet.
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