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CVE

CWE

Training

CVE-2025-3857

Published: Apr 21, 2025

Modified: Oct 14, 2025

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

Vendor	Product	Versions
Amazon	Amazon Ion Dotnet	affected `0 - < 1.3.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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

https://github.com/amazon-ion/ion-dotnet/releases/tag/v1.3.1

patch

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