CVE-2026-15788

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 80% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

July 20, 2026

Last Modified

August 5, 2026

Advisory Details (1)

Auto-updated Jul 20, 2026
Patch available. Sources: github.
github Patch Available

WCOW cache mount source selector resolves NTFS junctions outside of cache root · Advisory · moby/buildkit · GitHub

https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2

Vendor Advisories for CVE-2026-15788(5)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatbuildah-main-1.45.0-2.hum12026-08-06redhat
redhattrivy-main-0.72.0-0.1.2.hum12026-07-27redhat
redhatpodman-main-6.0.2-2.1.hum12026-07-23redhat
redhatbuildah-main-1.44.0-3.2.hum12026-07-22redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 78× 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 168 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-15788?
CVE-2026-15788 is a high vulnerability published on July 20, 2026. BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon…
When was CVE-2026-15788 disclosed?
CVE-2026-15788 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15788 actively exploited?
CVE-2026-15788 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 79.9% of all scored CVEs.
What is the CVSS score of CVE-2026-15788?
CVE-2026-15788 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-15788?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15788, 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

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