CVE-2026-26171

CVE-2026-26171 is a high-severity vulnerability in Microsoft .net with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Description

Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.

Frequently asked questions

What is CVE-2026-26171?
Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.
How severe is CVE-2026-26171?
CVE-2026-26171 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-26171 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26171?
CVE-2026-26171 primarily affects Microsoft .net. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-26171?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-26171 have an EU (EUVD) identifier?
Yes. CVE-2026-26171 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22404.
When was CVE-2026-26171 published?
CVE-2026-26171 was published on 2026-04-14 and last updated on 2026-06-30.

References

Affected products (2)

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