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CVE-2026-57108 Microsoft CVE debrief

A high-severity vulnerability, CVE-2026-57108, was found in .NET Core, allowing an unauthorized attacker to deny service over a network via a type confusion exploit. This vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. It affects .NET Core versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6. Users of these versions should apply patches to prevent potential denial-of-service attacks. The vulnerability allows an attacker to exploit a type confusion weakness in .NET Core, potentially leading to service denial over a network. The CVE record was published on 2026-07-14T18:18:35.150Z and last modified on 2026-07-20T17:14:03.263Z.

Vendor
Microsoft
Product
.NET 10.0
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

Users of .NET Core, particularly versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6, should apply patches to prevent potential denial-of-service attacks. Security teams and operators managing .NET Core installations should prioritize patching to mitigate the risk of service denial.

Technical summary

CVE-2026-57108 is a type confusion vulnerability in .NET Core. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. It allows an attacker to deny service over a network. The vulnerability affects .NET Core versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6. Users should verify their installations and apply patches as necessary.

Defensive priority

High priority should be given to patching .NET Core installations to prevent potential denial-of-service attacks. Security teams should review the vulnerability details and apply patches as necessary.

Recommended defensive actions

  • Apply patches for affected .NET Core versions
  • Inventory and update .NET Core installations
  • Monitor for potential denial-of-service attacks
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:18:35.150Z and last modified on 2026-07-20T17:14:03.263Z. The NVD entry is currently Analyzed. The vulnerability affects .NET Core versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6. Users should verify their installations and apply patches as necessary. The CVE details are based on information from official sources, but the impact and scope may vary depending on specific environments and configurations.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-57108 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-57108

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-57108 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-57108

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.