# MessagePack-CSharp MessagePack for C# vulnerabilities

Source: https://junglewise.ai/threats/technologies/messagepack-for-c  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/messagepack-for-c.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 11 vulnerabilities in MessagePack-CSharp MessagePack for C#: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-48517, was published on 22 June 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 11 (0 critical, 0 exploited in the wild)

## About MessagePack-CSharp MessagePack for C#

An extremely fast MessagePack serializer for C# (.NET, .NET Core, Unity, Xamarin).

## Latest MessagePack-CSharp MessagePack for C# vulnerabilities

- [CVE-2026-48517: MessagePack for C# security bypass in typeless deserialization](https://junglewise.ai/threats/cve-2026-48517-messagepack-for-c-security-bypass-in-typeless-deserialization) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48516: MessagePack for C# hash-collision DoS in InterfaceLookupFormatter](https://junglewise.ai/threats/cve-2026-48516-messagepack-for-c-hash-collision-dos-in-interfacelookupformatter) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48515: MessagePack for C# resource exhaustion in multi-dimensional array formatters](https://junglewise.ai/threats/cve-2026-48515-messagepack-for-c-resource-exhaustion-in-multi-dimensional-array) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48514: MessagePack for C# denial of service in UnsafeBlitFormatterBase](https://junglewise.ai/threats/cve-2026-48514-messagepack-for-c-denial-of-service-in-unsafeblitformatterbase) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48512: MessagePack for C# uncontrolled recursion in JSON conversion helpers](https://junglewise.ai/threats/cve-2026-48512-messagepack-for-c-uncontrolled-recursion-in-json-conversion) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48511: MessagePack for C# denial of service in ExpandoObjectFormatter](https://junglewise.ai/threats/cve-2026-48511-messagepack-for-c-denial-of-service-in-expandoobjectformatter) (high, CVSS 7.5, published 22 Jun 2026)
- [CVE-2026-48510: MessagePack for C# denial of service via LZ4 decompression bomb](https://junglewise.ai/threats/cve-2026-48510-messagepack-for-c-denial-of-service-via-lz4-decompression-bomb) (high, CVSS 7.5, published 22 Jun 2026)
- [CVE-2026-48509: MessagePack for C# insecure default in MessagePackInputFormatter](https://junglewise.ai/threats/cve-2026-48509-messagepack-for-c-insecure-default-in-messagepackinputformatter) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48506: MessagePack for C# uncontrolled recursion in MessagePackReader.TrySkip](https://junglewise.ai/threats/cve-2026-48506-messagepack-for-c-uncontrolled-recursion-in-messagepackreader) (high, CVSS 7.5, published 22 Jun 2026)
- [CVE-2026-48502: MessagePack for C# stack overflow in MessagePackReader.ReadDateTime](https://junglewise.ai/threats/cve-2026-48502-messagepack-for-c-stack-overflow-in-messagepackreader) (high, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48109: MessagePack for C# out-of-bounds read in LZ4 decompression](https://junglewise.ai/threats/cve-2026-48109-messagepack-for-c-out-of-bounds-read-in-lz4-decompression) (high, CVSS 8.2, published 22 Jun 2026)

## Most severe MessagePack-CSharp MessagePack for C# vulnerabilities

- [CVE-2026-48109: MessagePack for C# out-of-bounds read in LZ4 decompression](https://junglewise.ai/threats/cve-2026-48109-messagepack-for-c-out-of-bounds-read-in-lz4-decompression) (high, CVSS 8.2, published 22 Jun 2026)
- [CVE-2026-48506: MessagePack for C# uncontrolled recursion in MessagePackReader.TrySkip](https://junglewise.ai/threats/cve-2026-48506-messagepack-for-c-uncontrolled-recursion-in-messagepackreader) (high, CVSS 7.5, published 22 Jun 2026)
- [CVE-2026-48511: MessagePack for C# denial of service in ExpandoObjectFormatter](https://junglewise.ai/threats/cve-2026-48511-messagepack-for-c-denial-of-service-in-expandoobjectformatter) (high, CVSS 7.5, published 22 Jun 2026)
- [CVE-2026-48510: MessagePack for C# denial of service via LZ4 decompression bomb](https://junglewise.ai/threats/cve-2026-48510-messagepack-for-c-denial-of-service-via-lz4-decompression-bomb) (high, CVSS 7.5, published 22 Jun 2026)
- [CVE-2026-48502: MessagePack for C# stack overflow in MessagePackReader.ReadDateTime](https://junglewise.ai/threats/cve-2026-48502-messagepack-for-c-stack-overflow-in-messagepackreader) (high, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48509: MessagePack for C# insecure default in MessagePackInputFormatter](https://junglewise.ai/threats/cve-2026-48509-messagepack-for-c-insecure-default-in-messagepackinputformatter) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48516: MessagePack for C# hash-collision DoS in InterfaceLookupFormatter](https://junglewise.ai/threats/cve-2026-48516-messagepack-for-c-hash-collision-dos-in-interfacelookupformatter) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48515: MessagePack for C# resource exhaustion in multi-dimensional array formatters](https://junglewise.ai/threats/cve-2026-48515-messagepack-for-c-resource-exhaustion-in-multi-dimensional-array) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48514: MessagePack for C# denial of service in UnsafeBlitFormatterBase](https://junglewise.ai/threats/cve-2026-48514-messagepack-for-c-denial-of-service-in-unsafeblitformatterbase) (medium, CVSS 4, published 22 Jun 2026)
- [CVE-2026-48512: MessagePack for C# uncontrolled recursion in JSON conversion helpers](https://junglewise.ai/threats/cve-2026-48512-messagepack-for-c-uncontrolled-recursion-in-json-conversion) (medium, CVSS 4, published 22 Jun 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other MessagePack-CSharp technologies

- [MessagePack-CSharp](https://junglewise.ai/threats/technologies/messagepack-csharp): 10 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "MessagePack-CSharp MessagePack for C# vulnerabilities", https://junglewise.ai/threats/technologies/messagepack-for-c, 9 November 2026.