# MessagePack (NuGet) vulnerabilities

15 known vulnerabilities (4 high, 11 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://www.nuget.org/packages/MessagePack

## Advisories (15)

### [CVE-2026-92707](https://cve.now/CVE-2026-92707): MessagePack: Nested arrays can blow past buffer length limits

- Severity: Medium 5.3
- Published: Oct 15, 2026
- Affected: fixed in 2.5.303; from 3.0.0, fixed in 3.1.9.

### [CVE-2026-48109](https://cve.now/CVE-2026-48109): MessagePack-CSharp: LZ4 decompression may fail with AccessViolationException after dereferencing memory from bad input

- Severity: High 8.2
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0.214-rc.1, fixed in 3.1.7.

### [CVE-2026-48502](https://cve.now/CVE-2026-48502): MessagePack-CSharp: Denial of service vulnerabilities can swamp the CPU or crash the process with stack and heap overflows

- Severity: High 8.2
- Published: Jun 22, 2026
- Affected: from 3.0, fixed in 3.1.7.

### [CVE-2026-48506](https://cve.now/CVE-2026-48506): MessagePack-CSharp: MessagePackReader.Skip can recurse without enforcing maximum object graph depth

- Severity: High 7.5
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48509](https://cve.now/CVE-2026-48509): MessagePack-CSharp: ASP.NET Core MessagePackInputFormatter defaults to TrustedData for HTTP request bodies

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48510](https://cve.now/CVE-2026-48510): MessagePack-CSharp: LZ4 decompression allocates from unbounded declared output lengths

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48511](https://cve.now/CVE-2026-48511): MessagePack-CSharp: ExpandoObject formatter can perform quadratic insertion work on untrusted maps

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48512](https://cve.now/CVE-2026-48512): MessagePack-CSharp: JSON conversion APIs can recurse without consistent depth enforcement

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48513](https://cve.now/CVE-2026-48513): MessagePack-CSharp: DynamicUnionResolver generated deserializers miss depth enforcement

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48514](https://cve.now/CVE-2026-48514): MessagePack-CSharp: Unity unsafe blit formatter allocates from unbounded byte length

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48515](https://cve.now/CVE-2026-48515): MessagePack-CSharp: Multi-dimensional array formatters allocate from unchecked dimensions

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48516](https://cve.now/CVE-2026-48516): MessagePack-CSharp: InterfaceLookupFormatter bypasses collision-resistant comparer settings

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2026-48517](https://cve.now/CVE-2026-48517): MessagePack-CSharp: Typeless deserialization type restrictions do not recurse into arrays or generic arguments

- Severity: Medium 6.3
- Published: Jun 22, 2026
- Affected: fixed in 2.5.301; from 3.0, fixed in 3.1.7.

### [CVE-2024-48924](https://cve.now/CVE-2024-48924): MessagePack allows untrusted data to lead to DoS attack due to hash collisions and stack overflow

- Severity: High 8.7
- Published: Oct 17, 2024
- Affected: fixed in 2.5.187; from 2.6.95-alpha, fixed in 3.0.214-rc.1.

### [CVE-2020-5234](https://cve.now/CVE-2020-5234): Untrusted data can lead to DoS attack in MessagePack for C# and Unity

- Severity: Medium 4.8
- Published: Jan 31, 2020
- Affected: fixed in 1.9.11; from 2.0.0, fixed in 2.1.90.

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