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CVE-2026-48514

MEDIUM
6.3
CVSS 4.0
Description
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, UnsafeBlitFormatterBase<T>.Deserialize reads an attacker-controlled byteLength from an extension payload and allocates an array based on that value before validating it against the extension header length or remaining payload bytes. The outer extension header is bounded by available input, but that bound is not used to constrain the inner byteLength before allocation. A very small payload can therefore request a very large T[] allocation. This vulnerability is fixed in 2.5.301 and 3.1.7.

Metadata

CVE ID
CVE-2026-48514
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-21 16:18 UTC
Published
2026-06-22 21:11 UTC
Last updated
2026-06-22 21:11 UTC
Primary CWE
CWE-770
CWE-770: Allocation of Resources Without Limits or Throttlin…
Vendor / Product
MessagePack-CSharp / MessagePack-CSharp
Sources
cve.org  ·  NVD

Severity & Metrics

6.3 MEDIUM CVSS 4.0
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
Affected products (1)
VendorProductPlatformVersions
MessagePack-CSharp MessagePack-CSharp — >= 3.1.7, < 3.1.7, < 2.5.301
Weakness (CWE)
CWESourceDescription
CWE-770 cna CWE-770: Allocation of Resources Without Limits or Throttling
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.3 MEDIUM 4.0 cna 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
References (1)
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