CVE-2026-15788

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4% (35th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-46074 (ENISA EUVD)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 20, 2026

Last Modified

October 24, 2026

Advisory Details (1)

Auto-updated Jul 20, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

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 / EcosystemFix (by version range) / 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 14× in last 7d / 47× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 225 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 125 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-27 20:53 UTCEG score recompute
  4. 2026-10-27 20:53 UTCVendor advisory
  5. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-25 14:47 UTCEG score recompute
  9. 2026-10-24 20:27 UTCEG score recompute
  10. 2026-10-24 20:27 UTCVendor advisory
  11. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  12. 2026-10-24 15:33 UTCEG score recompute
  13. 2026-10-24 15:33 UTCVendor advisory
  14. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  20. 2026-10-18 04:01 UTCEG score recompute
  21. 2026-10-17 18:09 UTCEG score recompute
  22. 2026-10-17 18:09 UTCVendor advisory
  23. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  24. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  25. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
Show 75 more
  1. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  3. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  4. 2026-10-12 16:31 UTCEG score recompute
  5. 2026-10-11 20:09 UTCEG score recompute
  6. 2026-10-11 17:22 UTCEG score recompute
  7. 2026-10-11 14:55 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  12. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  15. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-10-04 14:54 UTCEG score recompute
  17. 2026-10-04 14:54 UTCVendor advisory
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-10-01 07:41 UTCEG score recompute
  21. 2026-10-01 07:41 UTCVendor advisory
  22. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  25. 2026-09-28 06:19 UTCEG score recompute
  26. 2026-09-28 06:19 UTCVendor advisory
  27. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  28. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  29. 2026-09-24 03:27 UTCEG score recompute
  30. 2026-09-24 03:27 UTCVendor advisory
  31. 2026-09-23 01:37 UTCEG score recompute
  32. 2026-09-23 01:37 UTCVendor advisory
  33. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-09-18 03:55 UTCEG score recompute
  35. 2026-09-18 03:55 UTCVendor advisory
  36. 2026-09-17 05:09 UTCEG score recompute
  37. 2026-09-17 05:09 UTCVendor advisory
  38. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  39. 2026-09-16 12:46 UTCEG score recompute
  40. 2026-09-16 12:46 UTCVendor advisory
  41. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  42. 2026-09-14 10:20 UTCVendor advisory
  43. 2026-09-13 22:44 UTCEG score recompute
  44. 2026-09-13 22:44 UTCVendor advisory
  45. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  46. 2026-09-13 08:26 UTCVendor advisory
  47. 2026-09-12 21:20 UTCEG score recompute
  48. 2026-09-12 21:20 UTCVendor advisory
  49. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  50. 2026-09-12 09:51 UTCVendor advisory
  51. 2026-09-11 20:31 UTCEG score recompute
  52. 2026-09-11 20:31 UTCVendor advisory
  53. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  54. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  55. 2026-09-11 09:20 UTCEG score recompute
  56. 2026-09-11 09:20 UTCVendor advisory
  57. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  58. 2026-09-09 11:50 UTCEG score recompute
  59. 2026-09-09 11:50 UTCVendor advisory
  60. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  61. 2026-09-07 22:49 UTCEG score recompute
  62. 2026-09-07 22:49 UTCVendor advisory
  63. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  64. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  65. 2026-09-06 11:30 UTCVendor advisory
  66. 2026-09-05 20:29 UTCEG score recompute
  67. 2026-09-05 20:29 UTCVendor advisory
  68. 2026-09-05 09:23 UTCEG score recompute
  69. 2026-09-05 09:23 UTCVendor advisory
  70. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  71. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  72. 2026-09-02 01:03 UTCEG score recompute
  73. 2026-09-02 01:03 UTCVendor advisory
  74. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  75. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 19th percentile

Related CVEs(same vendor + same CWE)

Same vendor

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redhat:RHSA-2026:44152 · redhat:RHSA-2026:43122 · redhat:RHSA-2026:51065

Frequently asked(5)

What is CVE-2026-15788?
CVE-2026-15788 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-15788 published?
The CVE record for CVE-2026-15788 was published on July 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-15788 actively exploited?
CVE-2026-15788 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-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?
A fix for CVE-2026-15788 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15788 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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