CVE-2026-48516
High · 7.5CVSS
7.5
EPSS
0.4%
Published
Jun 22, 2026
CISA due date
—
The record
MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, InterfaceLookupFormatter<TKey,TElement> constructs an internal Dictionary<TKey, IGrouping<TKey,TElement>> with the default equality comparer instead of the security-aware comparer supplied by options.Security.GetEqualityComparer<TKey>(). This formatter omission allows hash-collision CPU denial of service against ILookup<TKey,TElement> even when the application has opted into the untrusted-data security posture This vulnerability is fixed in 2.5.301 and 3.1.7.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
Related vulnerabilities
- CVE-2026-19630 In a BIND resolver, inbound DNS protocol messages with a particular structure will result… CWE-407
- CVE-2026-112894 Pillow is a Python imaging library. CWE-407
- CVE-2026-112891 Pillow is a Python imaging library. CWE-407
- CVE-2026-112401 Pillow is a Python imaging library. CWE-407
- CVE-2026-111766 markdown-it is a Markdown parser. CWE-407
- CVE-2026-111759 markdown-it is a Markdown parser. CWE-407
- CVE-2026-95838 containerd is an open-source container runtime. CWE-407
- CVE-2026-104844 PostCSS Selector Parser is a CSS selector parser that integrates with PostCSS but does… CWE-407