CVE-2026-48515— MessagePack-CSharp: Multi-dimensional array formatters allocate from unchecked dimensions
Possible ATT&CK Techniques 2AI
T1190 · Exploit Public-Facing Application T1210 · Exploitation of Remote ServicesAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MessagePack-CSharp | MessagePack-CSharp | >= 3.0, < 3.1.7 | affected |
< 2.5.301 | affected |
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-48515
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
MessagePack-CSharp: Multi-dimensional array formatters allocate from unchecked dimensions
Source: CVE Program / CVE List V5
Vulnerability Description
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, MessagePack-CSharp's multi-dimensional array formatters read dimension lengths directly from the payload and allocate T[,], T[,,], or T[,,,] before validating that the dimension product matches the encoded element count. The formatter reads a guarded element array header, but allocation of the target multi-dimensional array happens before the dimensions are checked against that element count. A small payload can therefore declare large dimensions, provide an empty or tiny inner array, and cause a large heap allocation before element data is validated. This vulnerability is fixed in 2.5.301 and 3.1.7.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
MessagePack-CSharp 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MessagePack-CSharp MessagePack-CSharp是MessagePack-CSharp团队的一款消息序列化工具。 MessagePack-CSharp 2.5.301之前版本和3.1.7之前版本存在资源管理错误漏洞，该漏洞源于多维数组格式化器直接从有效载荷读取维度长度并分配内存，可能导致大数据堆分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MessagePack-CSharp | MessagePack-CSharp | >= 3.0, < 3.1.7 | - |
II. Public POCs for CVE-2026-48515
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-48515
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-48515 (1)
Same Patch Batch · MessagePack-CSharp · 2026-06-22 · 12 CVEs total
| CVE-2026-48109 | 8.2 HIGH | MessagePack-CSharp: LZ4 decompression may fail with AccessViolationException after derefer |
| CVE-2026-48506 | 7.5 HIGH | MessagePack-CSharp: MessagePackReader.Skip can recurse without enforcing maximum object gr |
| CVE-2026-48516 | MessagePack-CSharp: InterfaceLookupFormatter bypasses collision-resistant comparer setting | |
| CVE-2026-48511 | MessagePack-CSharp: ExpandoObject formatter can perform quadratic insertion work on untrus | |
| CVE-2026-48513 | MessagePack-CSharp: DynamicUnionResolver generated deserializers miss depth enforcement | |
| CVE-2026-48512 | MessagePack-CSharp: JSON conversion APIs can recurse without consistent depth enforcement | |
| CVE-2026-48502 | MessagePack-CSharp: Denial of service vulnerabilities can swamp the CPU or crash the proce | |
| CVE-2026-48509 | MessagePack-CSharp: ASP.NET Core MessagePackInputFormatter defaults to TrustedData for HTT | |
| CVE-2026-48510 | MessagePack-CSharp: LZ4 decompression allocates from unbounded declared output lengths | |
| CVE-2026-48517 | MessagePack-CSharp: Typeless deserialization type restrictions do not recurse into arrays | |
| CVE-2026-48514 | MessagePack-CSharp: Unity unsafe blit formatter allocates from unbounded byte length |
IV. Related Vulnerabilities
Same product: MessagePack-CSharp
- CVE-2026-48109
MessagePack-CSharp: LZ4 decompression may fail with AccessVi - CVE-2026-48502
MessagePack-CSharp: Denial of service vulnerabilities can sw - CVE-2026-48506
MessagePack-CSharp: MessagePackReader.Skip can recurse witho - CVE-2026-48509
MessagePack-CSharp: ASP.NET Core MessagePackInputFormatter d - CVE-2026-48510
MessagePack-CSharp: LZ4 decompression allocates from unbound
Same vendor: MessagePack-CSharp
- CVE-2026-48109
MessagePack-CSharp: LZ4 decompression may fail with AccessVi - CVE-2026-48502
MessagePack-CSharp: Denial of service vulnerabilities can sw - CVE-2026-48506
MessagePack-CSharp: MessagePackReader.Skip can recurse witho - CVE-2026-48509
MessagePack-CSharp: ASP.NET Core MessagePackInputFormatter d - CVE-2026-48510
MessagePack-CSharp: LZ4 decompression allocates from unbound
Same weakness: CWE-770
- CVE-2026-73997
WordPress Starter Templates by Kadence WP plugin <= 2.3.3 - - CVE-2026-75841
ArcadeDB before 26.8.1 Denial of Service via range() - CVE-2026-47683
vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buff - CVE-2026-75050
JetBrains YouTrack 多个版本 DoS 漏洞 - CVE-2026-74878
openssl_encrypt before 1.4.0 TOTP Rate Limiter Bypass
V. Comments for CVE-2026-48515
No comments yet