CVE-2026-12391

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreMEDIUM confidence

Score 5.0 from GitHub Security Advisory published 2026-07-16. a secondary CVSS source baseline 5.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.0Exploit: None knownExposed: 0

A fix is available — apply it.

An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic information without verifying the file type or ownership. An unprivileged local attacker can exploit this behavior by creating a symbolic link (symlink) at a predictable destination path pointing to an arbitrary, root-readable file (such as /etc/shadow or private files within /root). When a root administrator or operator subsequently executes the pro collect-logs command, the tool follows the user-controlled symlink, reads the target file, and compresses its contents into the resulting diagnostic support archive. Because the output archive remains readable by the unprivileged user, the attacker can extract and read the sensitive root-owned files, leading to a complete information disclosure of system secrets.

CVSS v3
5.0
EG Score
5.0(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity50% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

July 16, 2026

Last Modified

July 16, 2026

References (1)

Vendor Advisories for CVE-2026-12391(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuubuntu-pro-client-l10n (37.2ubuntu0.1) @ resolute2026-09-18ubuntu

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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 62× 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 174 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-12391?
CVE-2026-12391 is a medium vulnerability published on July 16, 2026. An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic…
When was CVE-2026-12391 disclosed?
CVE-2026-12391 was first published in the National Vulnerability Database on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12391 actively exploited?
CVE-2026-12391 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 88.9% of all scored CVEs.
What is the CVSS score of CVE-2026-12391?
CVE-2026-12391 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-12391?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12391, 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.

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