What is CVE-2026-48506?

CVE-2026-48506 is a high-severity vulnerability in Messagepack, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-06-22.

How severe is CVE-2026-48506?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Messagepack

CVE-2026-48506

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7, MessagePackReader.TrySkip() recursively descends into nested arrays and maps without incrementing the reader depth or calling the configured depth checks. T…

EPSS: 0.005 (38.2th percentile) — read the EPSS interpretation.

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)

CWE-674 — Uncontrolled Recursion

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-48506?: CVE-2026-48506 is a high-severity vulnerability in Messagepack, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-06-22.
How severe is CVE-2026-48506?: High severity. CVSS v3 base score is 7.5 out of 10.