AutoMapper: Denial of Service via uncontrolled recursion that bypasses MaxDepth

published 2026-11-05 8d ago modified 2026-11-13 11h ago also EUVD-2026-125688 , GHSA-gpwp-5797-mjff

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: —; no EPSS score yet
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 4

nuget AutoMapper 15.1.4, 16.3.0

Is CVE-2026-128081 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
nuget	AutoMapper	>=16.0.0, <16.3.0 <15.1.4	16.3.0 15.1.4

Affected products

LuckyPennySoftware AutoMapper

Classification

Weakness

CWE-674 Uncontrolled Recursion

References

Sources

CVE List CVE-2026-128081
GitHub Advisory GHSA-gpwp-5797-mjff
NVD CVE-2026-128081
Maintainer advisory GHSA-gpwp-5797-mjff

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of LuckyPennySoftware/AutoMapper published their own advisory on GitHub. Reviewed sources take precedence over it.