CVE-2026-48513
Detail
Description
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, runtime-generated union deserializers emitted by DynamicUnionResolver do not call MessagePackSecurity.DepthStep(ref reader) and do not decrement reader.Depth around recursive deserialization and skip paths. This means union deserialization does not consistently participate in the maximum object graph depth enforcement that protects other recursive formatter paths. For unknown union keys, the emitted deserializer calls reader.Skip() on attacker-controlled data without an enclosing depth step. This vulnerability is fixed in 2.5.301 and 3.1.7.
Metrics
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.x Severity and Vector Strings:
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
Base
Score:
NVD assessment
not yet provided.
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Weakness Enumeration
| CWE-ID |
CWE Name |
Source |
|
CWE-674
|
Uncontrolled Recursion |
GitHub, Inc.
|
Change History
4 change records found show changes
CVE Modified by GitHub, Inc.
6/25/2026 12:16:36 PM
| Action |
Type |
Old Value |
New Value |
| Changed |
Affected |
[{"vendor":"MessagePack-CSharp","product":"MessagePack-CSharp","versions":[{"version":">= 3.1.7, < 3.1.7","status":"affected"},{"version":"< 2.5.301","status":"affected"}]}]
|
[{"vendor":"MessagePack-CSharp","product":"MessagePack-CSharp","versions":[{"version":">= 3.0, < 3.1.7","status":"affected"},{"version":"< 2.5.301","status":"affected"}]}]
|
Initial Analysis by NIST
6/23/2026 1:21:09 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CVSS V3.1 |
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
|
| Added |
CPE Configuration |
OR
*cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c#:*:* versions up to (excluding) 2.5.301
*cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c#:*:* versions from (including) 3.0.3 up to (excluding) 3.1.7
|
| Added |
Reference Type |
GitHub, Inc.: https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-wfr3-xj75-pfwh Types: Mitigation, Vendor Advisory
|
CVE Modified by CISA-ADP
6/23/2026 11:16:35 AM
| Action |
Type |
Old Value |
New Value |
| Added |
SSVC |
{"timestamp":"2026-06-23T14:25:43.764541Z","id":"CVE-2026-48513","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}
|
New CVE Received from GitHub, Inc.
6/22/2026 6:16:48 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Description |
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, runtime-generated union deserializers emitted by DynamicUnionResolver do not call MessagePackSecurity.DepthStep(ref reader) and do not decrement reader.Depth around recursive deserialization and skip paths. This means union deserialization does not consistently participate in the maximum object graph depth enforcement that protects other recursive formatter paths. For unknown union keys, the emitted deserializer calls reader.Skip() on attacker-controlled data without an enclosing depth step. This vulnerability is fixed in 2.5.301 and 3.1.7.
|
| Added |
CVSS V4.0 |
AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
|
| Added |
CWE |
CWE-674
|
| Added |
Reference |
https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-wfr3-xj75-pfwh
|
| Added |
Affected |
[{"vendor":"MessagePack-CSharp","product":"MessagePack-CSharp","versions":[{"version":">= 3.1.7, < 3.1.7","status":"affected"},{"version":"< 2.5.301","status":"affected"}]}]
|
Quick Info
CVE Dictionary Entry: CVE-2026-48513 NVD
Published Date: 06/22/2026 NVD
Last Modified: 06/25/2026
Source: GitHub, Inc.
|
