Allocation of Resources Without Limits or Throttling Affecting messagepack package, versions [,2.5.301)[3.0,3.1.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-MESSAGEPACK-17660963
- published28 Jun 2026
- disclosed25 Jun 2026
- creditAArnott
Introduced: 25 Jun 2026
NewCVE-2026-48510 (opens in a new tab)How to fix?
Upgrade MessagePack to version 2.5.301, 3.1.7 or higher.
Overview
MessagePack is a MessagePack(MsgPack) Serializer for C#(.NET, .NET Core, Unity, Xamarin).
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the TryDecompress process. An attacker can cause excessive memory allocation and potential denial of service by submitting specially crafted payloads with unreasonably large declared uncompressed lengths during deserialization with LZ4 compression enabled. This is only exploitable if LZ4 compression modes are enabled and attacker-controlled payloads are deserialized.
Workaround
This vulnerability can be mitigated by disabling LZ4 compression modes for untrusted inputs or enforcing strict compressed and decompressed size limits outside the affected library before deserialization.