CVE-2026-50659

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 57% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:microsoft, epss
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 26, 2026

Advisory Details (1)

Auto-updated Jul 15, 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-2026-50659

Vendor Advisories for CVE-2026-50659(14)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunetstandard-targeting-pack-2.1-8.0 (8.0.129-0ubuntu1~24.04.1) @ noble2026-07-26ubuntu
redhatdotnet10.0-0:10.0.110-1.el9_82026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el10_22026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el10_22026-07-20redhat
redhatdotnet10.0-0:10.0.110-1.el8_102026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el8_102026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el9_82026-07-20redhat
redhatdotnet8-0-main-8.0.129-2.1.hum12026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el10_22026-07-20redhat
redhatdotnet9.0-0:9.0.119-1.el8_102026-07-20redhat
redhatdotnet8.0-0:8.0.129-1.el9_82026-07-20redhat
redhatdotnet9-0-main-9.0.119-1.hum12026-07-15redhat
redhatdotnet10-0-main-10.0.109-1.hum12026-06-17redhat

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

(12 across 1 ecosystem)
NuGet(12)
PackageVulnerable rangeFixed inDependents
Microsoft.NetCore.App.Runtime.linux-arm8.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.linux-arm648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.linux-musl-arm8.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.linux-musl-arm648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.linux-musl-x648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.linux-x648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.osx-arm648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.osx-x648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.win-arm—8.0.29—
Microsoft.NetCore.App.Runtime.win-arm648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.win-x648.0.0 ... 8.0.8 (28 versions)8.0.29—
Microsoft.NetCore.App.Runtime.win-x868.0.0 ... 8.0.8 (28 versions)8.0.29—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 12× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 17:47 UTCEG score recompute
  2. 2026-07-26 17:47 UTCVendor advisory
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 04:39 UTCEG score recompute
  5. 2026-07-26 04:39 UTCVendor advisory
  6. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-24 14:18 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:18 UTCEG score recompute
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 15:25 UTCEPSS rescore
  12. 2026-07-20 17:08 UTCEPSS rescore
  13. 2026-07-19 02:38 UTCEG score recompute
  14. 2026-07-19 02:38 UTCVendor advisory
  15. 2026-07-19 02:29 UTCEPSS rescore
  16. 2026-07-18 10:04 UTCEPSS rescore
  17. 2026-07-17 07:16 UTCEG score recompute
  18. 2026-07-17 07:16 UTCVendor advisory
  19. 2026-07-16 17:16 UTCVendor advisory
  20. 2026-07-16 17:03 UTCEPSS rescore
  21. 2026-07-15 18:39 UTCVendor advisory
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 16:57 UTCEPSS rescore
  24. 2026-07-14 20:04 UTCEG score recompute
  25. 2026-07-14 20:04 UTCVendor advisory
Show 1 more
  1. 2026-07-14 20:01 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-50659?
CVE-2026-50659 is a medium vulnerability published on July 14, 2026. Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
When was CVE-2026-50659 disclosed?
CVE-2026-50659 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50659 actively exploited?
CVE-2026-50659 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.3% of all scored CVEs.
What is the CVSS score of CVE-2026-50659?
CVE-2026-50659 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-50659?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50659, 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-2026-50659

Explore →

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