Nerdbank.MessagePack has Inefficient CPU Computation

Impact Applications that call OptionalConverters.WithExpandoObjectConverter and deserialize untrusted data are open to a vulnerability by which an attacker can exploit a On² algorithm to burn an inordinate amount of CPU effort by adding a great many properties to an ExpandoObject, whose Add metho...

Inefficient CPU Computation

Overview Nerdbank.MessagePack is an A modern, fast and NativeAOT-compatible MessagePack serialization library Affected versions of this package are vulnerable to Inefficient CPU Computation in the WithExpandoObjectConverter. An attacker can cause excessive CPU consumption by deserializing special...

GHSA-92VJ-HP7M-GWCJ Nerdbank.MessagePack has Inefficient CPU Computation

Impact Applications that call OptionalConverters.WithExpandoObjectConverter and deserialize untrusted data are open to a vulnerability by which an attacker can exploit a On² algorithm to burn an inordinate amount of CPU effort by adding a great many properties to an ExpandoObject, whose Add metho...

GHSA-QJVR-435C-5FJH Nerdbank.MessagePack has a memory amplification DoS in collection deserialization

Nerdbank.MessagePack deserializers for many collection-shaped types trusted the element count declared in MessagePack array and map headers when allocating destination storage. A crafted payload could therefore force large arrays, pooled buffers, dictionaries, or collection instances to be...

Nerdbank.MessagePack has a memory amplification DoS in collection deserialization

Nerdbank.MessagePack deserializers for many collection-shaped types trusted the element count declared in MessagePack array and map headers when allocating destination storage. A crafted payload could therefore force large arrays, pooled buffers, dictionaries, or collection instances to be...

EUVD-2026-31426

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users v...

CVE-2026-44375

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...

CVE-2026-44375

The CVE-2026-44375 entry affects Nerdbank.MessagePack. The vulnerability arises in DateTime decoding where the reader can be fed a malicious MessagePack payload declaring an oversized timestamp extension length, enabling an attacker-controlled amount of stack memory to be allocated via stackalloc...

EUVD-2026-30299

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...

CVE-2026-44375 Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException

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...

CVE-2026-44375

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...

CVE-2026-44375 Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException

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...

Nerdbank.MessagePack 安全漏洞

Nerdbank.MessagePack is a .NET platform-specific MessagePack serialization library developed by Andrew Arnott. Versions of Nerdbank.MessagePack prior to 1.1.62 contained security vulnerabilities. These vulnerabilities stemmed from uncontrolled stack allocation during DateTime decoding. Malicious...

GHSA-2CWQ-PWFR-WCW3 Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException

Summary 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...

PT-2026-38312

Summary 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...

CVE-2026-32284

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data format codes 0xd4-0xd8. This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack...

CVE-2026-32284

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data format codes 0xd4-0xd8. This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack...

Out-of-bounds Read

Overview Affected versions of this package are vulnerable to Out-of-bounds Read due to improper validation of input in the fixext process. An attacker can cause the application to panic and terminate unexpectedly by sending specially crafted MessagePack data. Remediation There is no fixed version...

Out-of-bounds Read

Overview Affected versions of this package are vulnerable to Out-of-bounds Read due to improper validation of input in the fixext process. An attacker can cause the application to panic and terminate unexpectedly by sending specially crafted MessagePack data. Remediation There is no fixed version...

Out-of-bounds Read

Overview github.com/shamaton/msgpack/v3/internal/decoding is a None Affected versions of this package are vulnerable to Out-of-bounds Read. due to improper validation of input in the fixext process. An attacker can cause the application to panic and terminate unexpectedly by sending specially...