Is CVE-2026-48506 actively exploited?

No active exploitation of CVE-2026-48506 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-48506 be exploited remotely?

Yes. CVE-2026-48506 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-48506?

CVE-2026-48506 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-48506

CWE-674Published: June 22, 2026· Updated: Jun 23, 2026

7.5

CVSS v3.1

EPSS:0.27%probability of exploitation in 30 daysPercentile:19.1th

Official Description

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. This bypasses MessagePackSecurity.MaximumObjectGraphDepth, the library's documented protection against deeply nested object graphs. Many generated and dynamic formatters call reader.Skip() when they encounter unknown map keys, unknown array members, ignored fields, or data that should be skipped for forward compatibility. A deeply nested value in one of these skipped positions can therefore cause unbounded recursion and an uncatchable StackOverflowException. This vulnerability is fixed in 2.5.301 and 3.1.7.

NVD Source

Technical Analysis

CVE-2026-48506 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.