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CVE-2026-58280

Microsoft Security Advisory CVE-2026-58280 - .NET and Visual Studio Denial of Service Vulnerability

Published Oct 13, 2026 · evidence confidence high

Microsoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Xml and System.Private.Xml. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Signed XML fixes add input-depth and operation-count limits, prohibit DTD processing by default, validate entity references, bound encrypted-data candidate processing, and cap attributes and namespaces used by C14N transforms.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-58280 is a unknown public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: microsoft.netcore.app.runtime.linux-arm; microsoft.netcore.app.runtime.linux-arm64; microsoft.netcore.app.runtime.linux-musl-arm; microsoft.netcore.app.runtime.linux-musl-arm64. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: EPSS 1.1%. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: cve_org, epss, gitlab, ncsc_nl. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · GitLab Advisory Database

    Detected

    Microsoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Xml and System.Private.Xml. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Signed XML fixes add input-depth and operation-count limits, prohibit DTD processing by default, validate entity references, bo

Affected

  • nuget microsoft.netcore.app.runtime.linux-armversion unspecified
  • nuget microsoft.netcore.app.runtime.linux-arm64version unspecified
  • nuget microsoft.netcore.app.runtime.linux-musl-armversion unspecified
  • nuget microsoft.netcore.app.runtime.linux-musl-arm64version unspecified
  • nuget microsoft.netcore.app.runtime.linux-musl-x64version unspecified
  • nuget microsoft.netcore.app.runtime.linux-x64version unspecified
  • nuget microsoft.netcore.app.runtime.osx-arm64version unspecified
  • nuget microsoft.netcore.app.runtime.osx-x64version unspecified
  • nuget microsoft.netcore.app.runtime.win-armversion unspecified
  • nuget microsoft.netcore.app.runtime.win-arm64version unspecified
  • nuget microsoft.netcore.app.runtime.win-x64version unspecified
  • nuget microsoft.netcore.app.runtime.win-x86version unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-58280

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-58280

    30-day exploitation probability 1.1%

    first.org
  • GitLab Advisory DatabasePackage advisoryCVE-2026-58280

    Microsoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Xml and System.Private.Xml. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Signed XML fixes add input-depth and operation-count limits, prohibit DTD processing by default, validate entity references, bo

    advisories.gitlab.com
  • NCSC NetherlandsGovernment advisoryCVE-2026-58280

    Microsoft heeft kwetsbaarheden verholpen in diverse componenten van de Developer Tools, zoals .NET en Visual Studio. Een kwaadwillende kan aanvallen uitvoeren die kunnen leiden tot de categoriën schade zoals weergegeven in de onderstaande tabellen. .NET: |------------------|-----

    advisories.ncsc.nl