Bug 2548800 (CVE-2026-92707)
| Summary: | CVE-2026-92707 dotnet10.0: dotnet8.0: dotnet9.0: dotnet: MessagePack: Nested arrays can blow past buffer length limits | ||
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| Product: | [Other] Security Response | Reporter: | Charles Timko <ctimko> |
| Component: | vulnerability | Assignee: | Product Security <prodsec-ir-bot> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | rhel-process-autobot, security-response-team, watson-tool-maintainers |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter allocates an object[] from each declared array length before the configured object-graph depth limit rejects the input, while nested array headers can reuse the same trailing unread bytes to satisfy per-header length validation. A comparatively small payload can therefore keep many large arrays alive at once. When an attacker can submit such data repeatedly, the allocations can cause severe managed-heap pressure, excessive garbage collection, process termination, or loss of service. Exposure requires an application to deserialize untrusted data through the affected formatter path and permit repeated attacker-controlled submissions, such as a reachable ASP.NET Core SignalR hub method with an object parameter and AddMessagePackProtocol() enabled. This issue is fixed in versions 2.5.303 and 3.1.9.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 2561767, 2561768, 2561769 | ||
| Bug Blocks: | |||
| Deadline: | 2026-10-13 | ||
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Description
Charles Timko
2026-10-09 19:39:53 UTC
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:86168 https://access.redhat.com/errata/RHSA-2026:86168 This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:86195 https://access.redhat.com/errata/RHSA-2026:86195 This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:86172 https://access.redhat.com/errata/RHSA-2026:86172 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:86170 https://access.redhat.com/errata/RHSA-2026:86170 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:86192 https://access.redhat.com/errata/RHSA-2026:86192 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:86169 https://access.redhat.com/errata/RHSA-2026:86169 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:86171 https://access.redhat.com/errata/RHSA-2026:86171 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:86193 https://access.redhat.com/errata/RHSA-2026:86193 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:86594 https://access.redhat.com/errata/RHSA-2026:86594 This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:88424 https://access.redhat.com/errata/RHSA-2026:88424 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:88425 https://access.redhat.com/errata/RHSA-2026:88425 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:88422 https://access.redhat.com/errata/RHSA-2026:88422 This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:88474 https://access.redhat.com/errata/RHSA-2026:88474 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:89735 https://access.redhat.com/errata/RHSA-2026:89735 |