CVE-2026-45491

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% 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: epss, nvd
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 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
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

June 9, 2026

Last Modified

August 25, 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
ubuntunetstandard-targeting-pack-2.1-8.0 (8.0.128-0ubuntu1~24.04.1) @ noble2026-08-25ubuntu
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 15× in last 7d / 76× 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.

Showing the most recent 100 of 173 total refreshes for this CVE.

  1. 2026-08-25 23:09 UTCEG score recompute
  2. 2026-08-25 23:09 UTCVendor advisory
  3. 2026-08-25 13:49 UTCEPSS rescore
  4. 2026-08-24 15:39 UTCEG score recompute
  5. 2026-08-24 15:39 UTCVendor advisory
  6. 2026-08-23 11:11 UTCEG score recompute
  7. 2026-08-23 11:11 UTCVendor advisory
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-21 10:11 UTCEG score recompute
  11. 2026-08-21 10:11 UTCVendor advisory
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-20 09:01 UTCEG score recompute
  14. 2026-08-20 09:01 UTCVendor advisory
  15. 2026-08-19 17:04 UTCEPSS rescore
  16. 2026-08-18 13:48 UTCEPSS rescore
  17. 2026-08-17 16:09 UTCEG score recompute
  18. 2026-08-17 16:09 UTCVendor advisory
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-16 16:20 UTCEG score recompute
  21. 2026-08-16 16:20 UTCVendor advisory
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 16:24 UTCEG score recompute
  25. 2026-08-15 16:24 UTCVendor advisory
Show 75 more
  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-14 16:34 UTCEG score recompute
  3. 2026-08-14 16:34 UTCVendor advisory
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 21:02 UTCVendor advisory
  6. 2026-08-12 20:05 UTCEG score recompute
  7. 2026-08-12 20:05 UTCVendor advisory
  8. 2026-08-12 13:51 UTCEPSS rescore
  9. 2026-08-11 20:15 UTCEG score recompute
  10. 2026-08-11 20:15 UTCVendor advisory
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-10 20:26 UTCVendor advisory
  13. 2026-08-09 19:24 UTCEG score recompute
  14. 2026-08-09 19:24 UTCVendor advisory
  15. 2026-08-09 13:46 UTCEPSS rescore
  16. 2026-08-08 19:36 UTCEG score recompute
  17. 2026-08-08 19:36 UTCVendor advisory
  18. 2026-08-08 16:37 UTCEPSS rescore
  19. 2026-08-07 19:47 UTCEG score recompute
  20. 2026-08-07 19:47 UTCVendor advisory
  21. 2026-08-06 19:58 UTCEG score recompute
  22. 2026-08-06 19:58 UTCVendor advisory
  23. 2026-08-06 13:47 UTCEPSS rescore
  24. 2026-08-05 20:10 UTCEG score recompute
  25. 2026-08-05 20:10 UTCVendor advisory
  26. 2026-08-05 19:17 UTCEPSS rescore
  27. 2026-08-04 16:09 UTCEG score recompute
  28. 2026-08-04 16:09 UTCVendor advisory
  29. 2026-08-04 15:10 UTCEPSS rescore
  30. 2026-08-04 10:38 UTCEPSS rescore
  31. 2026-08-03 14:59 UTCEG score recompute
  32. 2026-08-03 14:59 UTCVendor advisory
  33. 2026-08-03 10:36 UTCEPSS rescore
  34. 2026-08-02 10:06 UTCEG score recompute
  35. 2026-08-02 10:06 UTCVendor advisory
  36. 2026-08-02 02:27 UTCEPSS rescore
  37. 2026-08-01 10:15 UTCEG score recompute
  38. 2026-08-01 10:15 UTCVendor advisory
  39. 2026-08-01 04:16 UTCEPSS rescore
  40. 2026-07-31 10:11 UTCEG score recompute
  41. 2026-07-31 10:11 UTCVendor advisory
  42. 2026-07-30 16:28 UTCEPSS rescore
  43. 2026-07-30 10:21 UTCEG score recompute
  44. 2026-07-30 10:21 UTCVendor advisory
  45. 2026-07-30 01:30 UTCEPSS rescore
  46. 2026-07-28 23:00 UTCEG score recompute
  47. 2026-07-28 23:00 UTCVendor advisory
  48. 2026-07-28 15:36 UTCEPSS rescore
  49. 2026-07-28 08:10 UTCEG score recompute
  50. 2026-07-28 08:10 UTCVendor advisory
  51. 2026-07-27 14:13 UTCEPSS rescore
  52. 2026-07-27 08:17 UTCEG score recompute
  53. 2026-07-27 08:17 UTCVendor advisory
  54. 2026-07-26 14:54 UTCEPSS rescore
  55. 2026-07-26 14:54 UTCEPSS rescore
  56. 2026-07-26 06:42 UTCEG score recompute▼ 0.70
  57. 2026-07-26 06:42 UTCVendor advisory
  58. 2026-07-25 14:18 UTCEPSS rescore
  59. 2026-07-24 14:17 UTCEPSS rescore
  60. 2026-07-23 14:18 UTCEPSS rescore
  61. 2026-07-23 09:51 UTCNVD updateCVSS v3 → 5.5
  62. 2026-07-23 03:16 UTCEG score recompute
  63. 2026-07-22 14:08 UTCEPSS rescore
  64. 2026-07-21 15:24 UTCEPSS rescore
  65. 2026-07-20 17:08 UTCEPSS rescore
  66. 2026-07-19 02:29 UTCEPSS rescore
  67. 2026-07-18 10:04 UTCEPSS rescore
  68. 2026-07-16 17:03 UTCEPSS rescore
  69. 2026-07-16 09:17 UTCVendor advisory
  70. 2026-07-15 16:57 UTCEPSS rescore
  71. 2026-07-15 08:16 UTCVendor advisory
  72. 2026-07-15 02:00 UTCEPSS rescore
  73. 2026-07-14 00:37 UTCVendor advisory
  74. 2026-07-13 22:30 UTCEPSS rescore
  75. 2026-07-13 06:13 UTCEPSS rescore

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 August 25, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 68.4% of all scored CVEs.
What is the CVSS score of CVE-2026-45491?
CVE-2026-45491 has a CVSS v3 base score of 5.5 (NVD).
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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