CVE-2026-45491

MEDIUMPre-NVD 6.26.2—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.2 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 69% 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
6.2
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.2Exploit: NoneExposed: 0

A fix is available — apply it.

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

CVSS v3
6.2
EG Score
6.2(medium)
EPSS
31.4%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 15, 2026

Advisory Details (1)

Auto-updated Jun 13, 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-2026-45491

Vendor Advisories for CVE-2026-45491(18)

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

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudotnet10 (10.0.109-10.0.9-0ubuntu1~26.04.1) @ resolute2026-07-16ubuntu
redhatdotnet9.0-0:9.0.118-1.el9_62026-06-29redhat
redhatdotnet8.0-0:8.0.128-1.el9_42026-06-23redhat
redhatdotnet8.0-0:8.0.128-1.el10_02026-06-22redhat
redhatdotnet8.0-0:8.0.128-1.el9_62026-06-22redhat
redhatdotnet9.0-0:9.0.118-1.el10_02026-06-22redhat
redhatdotnet8-0-main-8.0.128-1.hum12026-06-18redhat
redhatdotnet10-0-main-10.0.109-1.hum12026-06-17redhat
redhatdotnet8.0-0:8.0.128-1.el9_82026-06-11redhat
redhatdotnet10.0-0:10.0.109-1.el9_82026-06-11redhat
redhatdotnet9.0-0:9.0.118-1.el9_82026-06-11redhat
redhatdotnet9.0-0:9.0.118-1.el10_22026-06-10redhat
redhatdotnet8.0-0:8.0.128-1.el10_22026-06-10redhat
redhatdotnet10.0-0:10.0.109-1.el8_102026-06-10redhat
redhatdotnet9.0-0:9.0.118-1.el8_102026-06-10redhat
redhatdotnet8.0-0:8.0.128-1.el8_102026-06-10redhat
redhatdotnet10.0-0:10.0.109-1.el10_22026-06-10redhat
redhatdotnet9-0-main-9.0.117-1.hum12026-05-14redhat

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

(3 across 1 ecosystem)
NuGet(3)
PackageVulnerable rangeFixed inDependents
Microsoft.NETCore.App.Runtime.linux-x6410.0.0 ... 10.0.8 (9 versions)10.0.9—
Microsoft.NETCore.App.Runtime.osx-arm6410.0.0 ... 10.0.8 (9 versions)10.0.9—
Microsoft.NETCore.App.Runtime.win-x6410.0.0 ... 10.0.8 (9 versions)10.0.9—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 7× in last 7d / 51× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 02:29 UTCEPSS rescore
  5. 2026-07-18 10:04 UTCEPSS rescore
  6. 2026-07-16 17:03 UTCEPSS rescore
  7. 2026-07-16 09:17 UTCVendor advisory
  8. 2026-07-15 16:57 UTCEPSS rescore
  9. 2026-07-15 08:16 UTCVendor advisory
  10. 2026-07-15 02:00 UTCEPSS rescore
  11. 2026-07-14 00:37 UTCVendor advisory
  12. 2026-07-13 22:30 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-12 05:46 UTCEPSS rescore
  15. 2026-07-11 20:12 UTCVendor advisory
  16. 2026-07-11 08:27 UTCEPSS rescore
  17. 2026-07-10 20:23 UTCVendor advisory
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-09 02:30 UTCVendor advisory
  20. 2026-07-08 15:16 UTCEPSS rescore
  21. 2026-07-08 00:52 UTCVendor advisory
  22. 2026-07-07 13:46 UTCEPSS rescore
  23. 2026-07-06 16:27 UTCEPSS rescore
  24. 2026-07-06 02:23 UTCEPSS rescore
  25. 2026-07-05 15:41 UTCVendor advisory
Show 61 more
  1. 2026-07-05 02:30 UTCEPSS rescore
  2. 2026-07-04 15:51 UTCVendor advisory
  3. 2026-07-04 06:31 UTCEPSS rescore
  4. 2026-07-03 15:46 UTCVendor advisory
  5. 2026-07-02 15:01 UTCVendor advisory
  6. 2026-07-01 15:11 UTCVendor advisory
  7. 2026-07-01 15:07 UTCEPSS rescore
  8. 2026-06-30 23:22 UTCEPSS rescore
  9. 2026-06-30 15:22 UTCVendor advisory
  10. 2026-06-29 14:06 UTCEPSS rescore
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-29 12:07 UTCVendor advisory
  13. 2026-06-28 14:07 UTCEPSS rescore
  14. 2026-06-28 12:17 UTCVendor advisory
  15. 2026-06-28 04:56 UTCEPSS rescore
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-27 12:26 UTCVendor advisory
  18. 2026-06-27 03:08 UTCEPSS rescore
  19. 2026-06-26 12:36 UTCVendor advisory
  20. 2026-06-25 13:49 UTCEPSS rescore
  21. 2026-06-25 11:14 UTCVendor advisory
  22. 2026-06-24 14:05 UTCEPSS rescore
  23. 2026-06-24 11:25 UTCVendor advisory
  24. 2026-06-23 21:33 UTCEPSS rescore
  25. 2026-06-23 21:33 UTCEPSS rescore
  26. 2026-06-23 10:19 UTCVendor advisory
  27. 2026-06-22 14:25 UTCEPSS rescore
  28. 2026-06-22 14:25 UTCEPSS rescore
  29. 2026-06-22 05:08 UTCEG score recompute▲ 0.70
  30. 2026-06-22 05:08 UTCVendor advisory
  31. 2026-06-21 14:56 UTCEPSS rescore
  32. 2026-06-21 14:56 UTCEPSS rescore
  33. 2026-06-21 01:59 UTCEPSS rescore
  34. 2026-06-21 01:43 UTCMITRE cvelistV5CVSS v3 → 6.2
  35. 2026-06-20 21:29 UTCVendor advisory
  36. 2026-06-19 19:25 UTCEPSS rescore
  37. 2026-06-19 19:12 UTCVendor advisory
  38. 2026-06-18 19:22 UTCEG score recompute▼ 0.70
  39. 2026-06-18 19:22 UTCVendor advisory
  40. 2026-06-18 17:52 UTCEPSS rescore
  41. 2026-06-18 17:52 UTCEPSS rescore
  42. 2026-06-17 23:16 UTCNVD updateCVSS v3 → 5.5
  43. 2026-06-17 17:53 UTCEPSS rescore
  44. 2026-06-17 17:07 UTCVendor advisory
  45. 2026-06-16 17:52 UTCEPSS rescore
  46. 2026-06-16 16:07 UTCVendor advisory
  47. 2026-06-15 17:49 UTCEPSS rescore
  48. 2026-06-15 16:19 UTCVendor advisory
  49. 2026-06-14 16:26 UTCVendor advisory
  50. 2026-06-13 23:00 UTCEPSS rescore
  51. 2026-06-13 16:36 UTCVendor advisory
  52. 2026-06-12 23:12 UTCEPSS rescore
  53. 2026-06-12 23:12 UTCEPSS rescore
  54. 2026-06-12 16:48 UTCVendor advisory
  55. 2026-06-11 16:59 UTCVendor advisory
  56. 2026-06-11 14:00 UTCEPSS rescore
  57. 2026-06-10 22:18 UTCEPSS rescore
  58. 2026-06-10 17:10 UTCVendor advisory
  59. 2026-06-09 17:21 UTCEG score recompute
  60. 2026-06-09 17:21 UTCVendor advisory
  61. 2026-06-09 17:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-45491?
CVE-2026-45491 is a medium vulnerability published on June 9, 2026. Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.
When was CVE-2026-45491 disclosed?
CVE-2026-45491 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45491 actively exploited?
CVE-2026-45491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45491?
CVE-2026-45491 has a CVSS v4.0 base score of 6.2 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45491?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45491, 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-2026-45491

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