CVE-2026-44375
Published:May 14, 2026
Updated:May 18, 2026
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.
Affected Packages
nerdbank.messagepack (NUGET):
Affected version(s) >=0.1.705-alpha-gad428877b7 <1.1.62Fix Suggestion:
Update to version 1.1.62Nerdbank.MessagePack (NUGET):
Affected version(s) >=0.1.705-alpha-gad428877b7 <1.1.62Fix Suggestion:
Update to version 1.1.62Related Resources (7)
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Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Memory Allocation with Excessive Size Value
EPSS
Base Score:
0.04