Is MessagePack affected by CVE-2026-48109?

NuGet MessagePack is affected in =3.0.214-rc.1 <3.1.7.

Is CVE-2026-48109 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

high

CVE-2026-48109

Q: Is CVE-2026-48109 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

NuGet · MessagePack

Summary

MessagePack's LZ4 decompression may fail with AccessViolationException after dereferencing memory from bad input

Severity: high
EPSS: 0.5% (p42)
Also known as: GHSA-hv8m-jj95-wg3x
Published: 2026-06-11

References

Related advisories

CVE-2026-48506 — high · NuGet/MessagePack
CVE-2026-48502 — high · NuGet/MessagePack
CVE-2026-48517 — medium · NuGet/MessagePack
CVE-2026-48516 — medium · NuGet/MessagePack
CVE-2026-48515 — medium · NuGet/MessagePack
CVE-2026-48514 — medium · NuGet/MessagePack
CVE-2026-48513 — medium · NuGet/MessagePack
CVE-2026-48512 — medium · NuGet/MessagePack

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.