Resource exhaustion in Messagepack
CVE-2026-48514
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 v…
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Messagepack
- Messagepack-csharp — versions >= 3.1.7, < 3.1.7, < 2.5.301
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-48514?
- CVE-2026-48514 is a high-severity vulnerability in Messagepack, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-06-22.
- How severe is CVE-2026-48514?
- High severity. CVSS v3 base score is 7.5 out of 10.