CVE-2026-32933: AutoMapper is a convention-based object-object mapper in .NET

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HIGH 7.5REMOTEUPGRADE

CVE-2026-32933 is a high-severity flaw (CVSS 7.5) affecting automapper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 entir

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: luckypennysoftware

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 03:16 UTCPublished CVE record published
2026-06-17 10:36 UTCUpdated Record last modified

luckypennysoftware automapper UPGRADE

Affected: < 15.1.1 · >= 16.0.0 and < 16.1.1

Fixed in: 15.1.1, 16.1.1

Safe to downgrade to: a release before 16.0.0

1. Check installed version

apt-cache policy automapper || rpm -q automapper || automapper --version

2. UPGRADE to 15.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade automapper

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade automapper

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 16.0.0 (Debian / Ubuntu)

apt-cache madison automapper sudo apt install automapper=<VERSION_BEFORE_16.0.0> sudo apt-mark hold automapper

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list automapper sudo dnf downgrade automapper-<VERSION_BEFORE_16.0.0> sudo dnf versionlock add automapper

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-32933?

automapper: upgrade to 15.1.1, 16.1.1. Exact commands for each OS are on this page.

Is CVE-2026-32933 being exploited?

CVE-2026-32933 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-32933 affect?

CVE-2026-32933 affects automapper. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-32933?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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