CVE-2026-128081
Received Received - Intake

Stack Overflow in AutoMapper Polymorphic Mapping

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: GitHub, Inc.

Description
AutoMapper is a convention-based object-object mapper in .NET. Prior to 15.1.4 and from 16.0.0 until 16.3.0, AutoMapper can recurse without an effective MaxDepth limit when mapping polymorphic graphs through Include or IncludeBase, runtime-typed object or interface members, nested Dictionary<string, object> or ExpandoObject sources, or recursive ConvertUsing type converters. Deep attacker-influenced graphs on these paths can throw an uncatchable StackOverflowException and terminate the process. This issue is fixed in versions 15.1.4 and 16.3.0.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-128081
EUVD
EUVD-2026-125688

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
automapper auto_mapper to 15.1.4 (inc)
automapper auto_mapper From 16.0.0 (inc) to 16.3.0 (inc)
automapper auto_mapper to 16.3.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-674 The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

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Executive Summary

AutoMapper is a .NET library that maps objects to other objects. This vulnerability allows an attacker to create deeply nested object graphs that cause AutoMapper to recurse without a limit, leading to a StackOverflowException and process termination. It affects versions before 15.1.4 and between 16.0.0 and 16.3.0 when mapping polymorphic graphs, runtime-typed members, or nested dictionaries.

Detection Guidance

Detecting this vulnerability requires checking the AutoMapper version in use. If you are running AutoMapper versions between 16.0.0 and 16.2.9 or versions prior to 15.1.4, the system is vulnerable. Run commands like 'dotnet list package' or check project files for AutoMapper version references.

Impact Analysis

This vulnerability can cause your application to crash unexpectedly due to a StackOverflowException. If exploited, it may lead to denial-of-service conditions, disrupting service availability for users. It does not directly expose data but can make systems unstable.

Mitigation Strategies

Upgrade AutoMapper to version 15.1.4 or 16.3.0 or later immediately. If upgrading is not possible, avoid using Include, IncludeBase, runtime-typed members, nested Dictionary<string, object>, ExpandoObject sources, or recursive ConvertUsing type converters in mappings.

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