Nerdbank.MessagePack is a NativeAOT-compatible MessagePack serialization library. Prior to 1.1.62, Nerdbank.MessagePack contains an uncontrolled stack allocation vulnerability in DateTime decoding. A malicious MessagePack payload can declare an oversized timestamp extension length, causing the reader to allocate an attacker-controlled number of bytes on the stack. This can trigger a StackOverflowException, which is not catchable by user code and terminates the process. This vulnerability is fixed in 1.1.62.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-2cwq-pwfr-wcw3 Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sun, 17 May 2026 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Aarnott
Aarnott nerdbank.messagepack
Vendors & Products Aarnott
Aarnott nerdbank.messagepack

Thu, 14 May 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 14 May 2026 15:15:00 +0000

Type Values Removed Values Added
Description Nerdbank.MessagePack is a NativeAOT-compatible MessagePack serialization library. Prior to 1.1.62, Nerdbank.MessagePack contains an uncontrolled stack allocation vulnerability in DateTime decoding. A malicious MessagePack payload can declare an oversized timestamp extension length, causing the reader to allocate an attacker-controlled number of bytes on the stack. This can trigger a StackOverflowException, which is not catchable by user code and terminates the process. This vulnerability is fixed in 1.1.62.
Title Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException
Weaknesses CWE-789
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-14T16:02:12.327Z

Reserved: 2026-05-05T20:15:20.631Z

Link: CVE-2026-44375

cve-icon Vulnrichment

Updated: 2026-05-14T16:02:08.172Z

cve-icon NVD

Status : Deferred

Published: 2026-05-14T15:16:48.383

Modified: 2026-05-14T18:19:25.260

Link: CVE-2026-44375

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-17T17:09:13Z

Weaknesses