CVE-2026-92707
- Source
- https://cve.org/CVERecord?id=CVE-2026-92707
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92707.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-92707
- Aliases
- Published
- 2026-10-15T18:35:49Z
- Modified
- 2026-10-16T10:46:30Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- MessagePack: Nested arrays can blow past buffer length limits
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-1325" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92707.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92707.json
- https://github.com/MessagePack-CSharp/MessagePack-CSharp/commit/7fd78bbf3476e03beae8b0f7a521125525a8a64a
- https://github.com/MessagePack-CSharp/MessagePack-CSharp/commit/95b63fca4f7097d3cac12d1a95286af4b4bbf02c
- https://github.com/MessagePack-CSharp/MessagePack-CSharp/releases/tag/v2.5.303
- https://github.com/MessagePack-CSharp/MessagePack-CSharp/releases/tag/v3.1.9
- https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-qhrr-8q5h-9q3h
- https://nvd.nist.gov/vuln/detail/CVE-2026-92707
Affected packages
Git / github.com/messagepack-csharp/messagepack-csharp
Affected ranges
- Type
- GIT
- Repo
- https://github.com/messagepack-csharp/messagepack-csharp
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "0" }, { "fixed": "2.5.303" }, { "introduced": "3.0.0" }, { "fixed": "3.1.9" } ], "source": "AFFECTED_FIELD" }