CVE-2026-26171

HIGHPre-NVD 7.57.5—Trending — 3 sources updated this week

7.5

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

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 87.0%
KEV: Not listed

Published

April 14, 2026

Last Modified

June 1, 2026

Advisory Details (1)

Auto-updated May 7, 2026

Patch available. Sources: microsoft.

microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26171

Vendor Advisories for CVE-2026-26171(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-26171
Microsoft Security Response Center (MSRC)High
.NET Denial of Service Vulnerability

Patch Availability(19)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	netstandard-targeting-pack-2.1-9.0 (9.0.116-0ubuntu1~25.10.1) @ questing	2026-06-02	ubuntu
ubuntu	dotnet10 (10.0.107-10.0.7-0ubuntu1~26.04.1) @ resolute	2026-06-02	ubuntu
redhat	dotnet8.0-0:8.0.126-1.el9_4	2026-05-05	redhat
redhat	dotnet8.0-0:8.0.126-1.el10_0	2026-05-04	redhat
redhat	dotnet9.0-0:9.0.116-1.el10_0	2026-05-04	redhat
redhat	dotnet8.0-0:8.0.126-1.el9_6	2026-05-04	redhat
redhat	dotnet9.0-0:9.0.116-1.el9_6	2026-05-04	redhat
redhat	dotnet9-0-main-9.0.116-1.hum1	2026-04-21	redhat
redhat	dotnet10-0-main-10.0.106-1.hum1	2026-04-20	redhat
redhat	dotnet8-0-main-8.0.126-1.hum1	2026-04-20	redhat
redhat	dotnet9.0-0:9.0.116-1.el9_7	2026-04-16	redhat
redhat	dotnet10.0-0:10.0.106-1.el10_1	2026-04-16	redhat
redhat	dotnet8.0-0:8.0.126-1.el10_1	2026-04-16	redhat
redhat	dotnet9.0-0:9.0.116-1.el10_1	2026-04-16	redhat
redhat	dotnet10.0-0:10.0.106-1.el9_7	2026-04-16	redhat
redhat	dotnet9.0-0:9.0.116-1.el8_10	2026-04-16	redhat
redhat	dotnet8.0-0:8.0.126-1.el9_7	2026-04-16	redhat
redhat	dotnet8.0-0:8.0.126-1.el8_10	2026-04-16	redhat
redhat	dotnet10.0-0:10.0.106-1.el8_10	2026-04-16	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

NuGet(1)

Package	Vulnerable range	Fixed in	Dependents
System.Security.Cryptography.Xml	8.0.0, 8.0.1, 8.0.2	8.0.3	—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(19)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 15× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:13 UTCepss_batch
2026-06-02 20:13 UTCepss_batch
2026-06-02 18:37 UTCEG score recompute
2026-06-02 18:37 UTCVendor advisory
2026-06-01 20:04 UTCEG score recompute
2026-06-01 20:04 UTCVendor advisory
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2026-26171?

CVE-2026-26171 is a high vulnerability published on April 14, 2026. Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.

When was CVE-2026-26171 disclosed?

CVE-2026-26171 was first published in the National Vulnerability Database on April 14, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-26171 actively exploited?

CVE-2026-26171 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-26171?

CVE-2026-26171 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-26171?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26171, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-26171

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CVE-2026-26171

Published

Last Modified

Advisory Details (1)

Security Update Guide - Microsoft Security Response Center

Vendor Advisories for CVE-2026-26171(1)

Patch Availability(19)

Affected Packages

Weakness Classification(2)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-26171?

Same vendor

Same CWE

CVE-2026-26171

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Security Update Guide - Microsoft Security Response Center

📣 Vendor Advisories for CVE-2026-26171(1)

Patch Availability(19)

Affected Packages

Weakness Classification(2)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-26171?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

Advisory Details (1)

Vendor Advisories for CVE-2026-26171(1)

Frequently asked(5)

Related CVEs(same vendor + same CWE)