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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- published28 Jun 2026
- disclosed25 Jun 2026
- creditAArnott
Introduced: 25 Jun 2026
NewCVE-2026-48514 (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 in the Deserialize function. An attacker can cause excessive memory allocation or process termination by sending a crafted extension payload with a large declared byte length, leading to resource exhaustion before proper validation occurs. This is only exploitable if Unity blit resolvers are used to deserialize untrusted payloads.
Workaround
This vulnerability can be mitigated by avoiding the use of Unity blit resolvers on data received from untrusted sources and by explicitly validating and size-limiting messages before deserialization.