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
Trending — 3 sources updated this week
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
30.8%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 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) @ resolute2026-07-05ubuntu
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
redhatdotnet10.0-0:10.0.109-1.el9_82026-06-11redhat
redhatdotnet8.0-0:8.0.128-1.el9_82026-06-11redhat
redhatdotnet9.0-0:9.0.118-1.el9_82026-06-11redhat
redhatdotnet8.0-0:8.0.128-1.el10_22026-06-10redhat
redhatdotnet10.0-0:10.0.109-1.el10_22026-06-10redhat
redhatdotnet9.0-0:9.0.118-1.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
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 18× in last 7d / 87× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-05 15:41 UTCEG score recompute
  4. 2026-07-05 15:41 UTCVendor advisory
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-04 15:51 UTCEG score recompute
  7. 2026-07-04 15:51 UTCVendor advisory
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-03 15:46 UTCEG score recompute
  10. 2026-07-03 15:46 UTCVendor advisory
  11. 2026-07-02 15:01 UTCEG score recompute
  12. 2026-07-02 15:01 UTCVendor advisory
  13. 2026-07-01 15:11 UTCEG score recompute
  14. 2026-07-01 15:11 UTCVendor advisory
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-06-30 23:22 UTCEPSS rescore
  17. 2026-06-30 15:22 UTCEG score recompute
  18. 2026-06-30 15:22 UTCVendor advisory
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-29 12:07 UTCEG score recompute
  22. 2026-06-29 12:07 UTCVendor advisory
  23. 2026-06-28 14:07 UTCEPSS rescore
  24. 2026-06-28 12:17 UTCEG score recompute
  25. 2026-06-28 12:17 UTCVendor advisory
Show 62 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-27 12:26 UTCEG score recompute
  4. 2026-06-27 12:26 UTCVendor advisory
  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-26 12:36 UTCEG score recompute
  7. 2026-06-26 12:36 UTCVendor advisory
  8. 2026-06-25 13:49 UTCEPSS rescore
  9. 2026-06-25 11:14 UTCEG score recompute
  10. 2026-06-25 11:14 UTCVendor advisory
  11. 2026-06-24 14:05 UTCEPSS rescore
  12. 2026-06-24 11:25 UTCEG score recompute
  13. 2026-06-24 11:25 UTCVendor advisory
  14. 2026-06-23 21:33 UTCEPSS rescore
  15. 2026-06-23 21:33 UTCEPSS rescore
  16. 2026-06-23 10:19 UTCEG score recompute
  17. 2026-06-23 10:19 UTCVendor advisory
  18. 2026-06-22 14:25 UTCEPSS rescore
  19. 2026-06-22 14:25 UTCEPSS rescore
  20. 2026-06-22 05:08 UTCEG score recompute▲ 0.70
  21. 2026-06-22 05:08 UTCVendor advisory
  22. 2026-06-21 14:56 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 01:59 UTCEPSS rescore
  25. 2026-06-21 01:43 UTCMITRE cvelistV5CVSS v3 → 6.2
  26. 2026-06-20 21:29 UTCEG score recompute
  27. 2026-06-20 21:29 UTCVendor advisory
  28. 2026-06-19 19:25 UTCEPSS rescore
  29. 2026-06-19 19:12 UTCEG score recompute
  30. 2026-06-19 19:12 UTCVendor advisory
  31. 2026-06-18 19:22 UTCEG score recompute▼ 0.70
  32. 2026-06-18 19:22 UTCVendor advisory
  33. 2026-06-18 17:52 UTCEPSS rescore
  34. 2026-06-18 17:52 UTCEPSS rescore
  35. 2026-06-17 23:16 UTCNVD updateCVSS v3 → 5.5
  36. 2026-06-17 17:53 UTCEPSS rescore
  37. 2026-06-17 17:07 UTCEG score recompute
  38. 2026-06-17 17:07 UTCVendor advisory
  39. 2026-06-16 17:52 UTCEPSS rescore
  40. 2026-06-16 16:07 UTCEG score recompute
  41. 2026-06-16 16:07 UTCVendor advisory
  42. 2026-06-15 17:49 UTCEPSS rescore
  43. 2026-06-15 16:19 UTCEG score recompute
  44. 2026-06-15 16:19 UTCVendor advisory
  45. 2026-06-14 16:26 UTCEG score recompute
  46. 2026-06-14 16:26 UTCVendor advisory
  47. 2026-06-13 23:00 UTCEPSS rescore
  48. 2026-06-13 16:36 UTCEG score recompute
  49. 2026-06-13 16:36 UTCVendor advisory
  50. 2026-06-12 23:12 UTCEPSS rescore
  51. 2026-06-12 23:12 UTCEPSS rescore
  52. 2026-06-12 16:48 UTCEG score recompute
  53. 2026-06-12 16:48 UTCVendor advisory
  54. 2026-06-11 16:59 UTCEG score recompute
  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 UTCEG score recompute
  59. 2026-06-10 17:10 UTCVendor advisory
  60. 2026-06-09 17:21 UTCEG score recompute
  61. 2026-06-09 17:21 UTCVendor advisory
  62. 2026-06-09 17:17 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

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 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45491 actively exploited?
CVE-2026-45491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.8% 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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