Vulnerability-Lookup

CVE-2026-32933 (GCVE-0-2026-32933)

Vulnerability from cvelistv5 – Published: 2026-03-20 02:38 – Updated: 2026-03-20 20:02

Title

AutoMapper Vulnerable to Denial of Service (DoS) via Uncontrolled Recursion

Summary

AutoMapper is a convention-based object-object mapper in .NET. Versions prior to 15.1.1 and 16.1.1 are vulnerable to a Denial of Service (DoS) attack. When mapping deeply nested object graphs, the library uses recursive method calls without enforcing a default maximum depth limit. This allows an attacker to provide a specially crafted object graph that exhausts the thread's stack memory, triggering a `StackOverflowException` and causing the entire application process to terminate. Versions 15.1.1 and 16.1.1 fix the issue.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-20 20:02 UTC

CWE

CWE-674 - Uncontrolled Recursion

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/LuckyPennySoftware/AutoMapper/…	x_refsource_CONFIRM
https://github.com/LuckyPennySoftware/AutoMapper/…	x_refsource_MISC
https://github.com/LuckyPennySoftware/AutoMapper/…	x_refsource_MISC
https://github.com/LuckyPennySoftware/AutoMapper/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
LuckyPennySoftware	AutoMapper	Affected: >= 16.0.0, < 16.1.1 Affected: < 15.1.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-32933

Vulnerability from fkie_nvd - Published: 2026-03-20 03:16 - Updated: 2026-06-17 10:36

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/LuckyPennySoftware/AutoMapper/commit/0afaf1e91648fca1a57512e94dd00a76ee016816	Patch
security-advisories@github.com	https://github.com/LuckyPennySoftware/AutoMapper/releases/tag/v15.1.1	Release Notes
security-advisories@github.com	https://github.com/LuckyPennySoftware/AutoMapper/releases/tag/v16.1.1	Release Notes
security-advisories@github.com	https://github.com/LuckyPennySoftware/AutoMapper/security/advisories/GHSA-rvv3-g6hj-g44x	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	luckypennysoftware	automapper	*
	luckypennysoftware	automapper	*

JSON

To clipboard

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    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/LuckyPennySoftware/AutoMapper/releases/tag/v16.1.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/LuckyPennySoftware/AutoMapper/security/advisories/GHSA-rvv3-g6hj-g44x"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-674"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-RVV3-G6HJ-G44X

Vulnerability from github – Published: 2026-03-13 20:57 – Updated: 2026-03-25 18:53

Summary

AutoMapper Vulnerable to Denial of Service (DoS) via Uncontrolled Recursion

Details

Summary

AutoMapper is vulnerable to a Denial of Service (DoS) attack. When mapping deeply nested object graphs, the library uses recursive method calls without enforcing a default maximum depth limit. This allows an attacker to provide a specially crafted object graph that exhausts the thread's stack memory, triggering a StackOverflowException and causing the entire application process to terminate.

Description

The vulnerability exists in the core mapping engine. When a source object contains a property of the same type (or a type that eventually points back to itself), AutoMapper recursively attempts to map each level.

Because there is no default limit on how many levels deep this recursion can go, a sufficiently nested object (approximately 25,000+ levels in standard .NET environments) will exceed the stack size. Since StackOverflowException cannot be caught in modern .NET runtimes, the application cannot recover and will crash immediately.

Impact

Availability: An attacker can crash the application server, leading to a complete Denial of Service.
Process Termination: Unlike standard exceptions, this terminates the entire process, not just the individual request thread.

Proof of Concept (PoC)

The following C# code demonstrates the crash by creating a nested "Circular" object graph and attempting to map it:

class Circular { public Circular Self { get; set; } }

// Setup configuration
var config = new MapperConfiguration(cfg => {
    cfg.CreateMap<Circular, Circular>();
});
var mapper = config.CreateMapper();

// Create a deeply nested object (28,000+ levels)
var root = new Circular();
var current = root;
for (int i = 0; i < 30000; i++) {
    current.Self = new Circular();
    current = current.Self;
}

// This call triggers the StackOverflowException and crashes the process
mapper.Map<Circular>(root);

Recommended Mitigation

Secure Defaults: Implement a default MaxDepth (e.g., 32 or 64) for all mapping operations.
Configurable Limit: Allow users to increase this limit if necessary, but ensure it is enabled by default to protect unsuspecting developers.

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "AutoMapper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "16.0.0"
            },
            {
              "fixed": "16.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "AutoMapper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "15.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-32933"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-674"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-13T20:57:07Z",
    "nvd_published_at": "2026-03-20T03:16:00Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nAutoMapper is vulnerable to a Denial of Service (DoS) attack. When mapping deeply nested object graphs, the library uses recursive method calls without enforcing a default maximum depth limit. This allows an attacker to provide a specially crafted object graph that exhausts the thread\u0027s stack memory, triggering a `StackOverflowException` and causing the entire application process to terminate.\n\n### Description\n\nThe vulnerability exists in the core mapping engine. When a source object contains a property of the same type (or a type that eventually points back to itself), AutoMapper recursively attempts to map each level.\n\nBecause there is no default limit on how many levels deep this recursion can go, a sufficiently nested object (approximately 25,000+ levels in standard .NET environments) will exceed the stack size. Since `StackOverflowException` cannot be caught in modern .NET runtimes, the application cannot recover and will crash immediately.\n\n### Impact\n\n* **Availability:** An attacker can crash the application server, leading to a complete Denial of Service.\n* **Process Termination:** Unlike standard exceptions, this terminates the entire process, not just the individual request thread.\n\n### Proof of Concept (PoC)\n\nThe following C# code demonstrates the crash by creating a nested \"Circular\" object graph and attempting to map it:\n\n```csharp\nclass Circular { public Circular Self { get; set; } }\n\n// Setup configuration\nvar config = new MapperConfiguration(cfg =\u003e {\n    cfg.CreateMap\u003cCircular, Circular\u003e();\n});\nvar mapper = config.CreateMapper();\n\n// Create a deeply nested object (28,000+ levels)\nvar root = new Circular();\nvar current = root;\nfor (int i = 0; i \u003c 30000; i++) {\n    current.Self = new Circular();\n    current = current.Self;\n}\n\n// This call triggers the StackOverflowException and crashes the process\nmapper.Map\u003cCircular\u003e(root);\n\n```\n\n### Recommended Mitigation\n\n1. **Secure Defaults:** Implement a default `MaxDepth` (e.g., 32 or 64) for all mapping operations.\n2. **Configurable Limit:** Allow users to increase this limit if necessary, but ensure it is enabled by default to protect unsuspecting developers.",
  "id": "GHSA-rvv3-g6hj-g44x",
  "modified": "2026-03-25T18:53:07Z",
  "published": "2026-03-13T20:57:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/LuckyPennySoftware/AutoMapper/security/advisories/GHSA-rvv3-g6hj-g44x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32933"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LuckyPennySoftware/AutoMapper/commit/0afaf1e91648fca1a57512e94dd00a76ee016816"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/LuckyPennySoftware/AutoMapper"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LuckyPennySoftware/AutoMapper/discussions/4624"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LuckyPennySoftware/AutoMapper/releases/tag/v15.1.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/LuckyPennySoftware/AutoMapper/releases/tag/v16.1.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "AutoMapper Vulnerable to Denial of Service (DoS) via Uncontrolled Recursion"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-32933 (GCVE-0-2026-32933)

FKIE_CVE-2026-32933

GHSA-RVV3-G6HJ-G44X

Summary

Description

Impact

Proof of Concept (PoC)

Recommended Mitigation

Tags

Sightings

Nomenclature

Related by attack behaviour