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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-32933: 0.55% estimated exploitation activity in the next 30 days; percentile 46.17 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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…

Published by the source

13 Mar 2026, 20:57 UTC

Last modified by the source

14 May 2026, 06:10 UTC

Source last checked

26 Oct 2026, 17:04 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-rvv3-g6hj-g44x

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# Patch Next advisory brief: CVE-2026-32933

Advisory: AutoMapper Vulnerable to Denial of Service (DoS) via Uncontrolled Recursion
IDs: CVE-2026-32933, GHSA-rvv3-g6hj-g44x
Record: https://patchnext.com/advisories/cve-2026-32933 (revision 1, source checked 26 Oct 2026, 17:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: automapper 16.1.1, 15.1.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet automapper: affected >= 16.0.0, < 16.1.1; < 15.1.1; fixed in 15.1.1, 16.1.1

## Suggested inspection (read-only)
- NuGet automapper: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on automapper.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-rvv3-g6hj-g44x (GitHub-reviewed advisory GHSA-rvv3-g6hj-g44x lists affected ranges: NuGet automapper >=16.0.0 =0 <15.1.1)

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