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Advisory record · GHSA-v7vf-f5q6-m899

.NET Remote Code Execution Vulnerability

CVSS 9.8 CriticalCriticalEPSS 0.036 · 89th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 12 Nov 2024, 23:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
System.Formats.NrbfNuGet<9.0.09.0.0
Identifiers
GHSA-v7vf-f5q6-m899 · BIT-dotnet-2024-43498 · BIT-dotnet-sdk-2024-43498 · CVE-2024-43498
Weakness (CWE)
CWE-843
Tags
Published
12 Nov 2024
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

System.Formats.Nrbf versions before 9.0.0 are affected by a remote code execution vulnerability. A remote unauthenticated attacker could exploit it by sending specially crafted requests to a vulnerable web app or by loading a specially crafted file into a vulnerable application, but only applications that use the NrbfDecoder component are affected. Upgrade System.Formats.Nrbf to 9.0.0 or later, and also install the latest .NET 9.0 runtime or SDK.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.036, the 89th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 12 Nov 2024, 19:29 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 15:21 UTC First seen by agentprime
  3. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.