CVE-2026-12249

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-22. a secondary CVSS source baseline 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 9.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An issue was discovered in Canonical ADSys upstream versions through v0.16.2. During Active Directory Certificate Services (AD CS) certificate auto-enrollment via the vendored Samba client script (internal/policies/certificate/python/vendor_samba/gp/gp_cert_auto_enroll_ext.py), ADSys utilizes a plaintext HTTP connection (http://) instead of a secure HTTPS connection (https://) to request the CA certificate from the Active Directory Certificate Services server (GetCACert). An unauthenticated network attacker positioned between the managed Ubuntu host and the configured AD CS CA hostname can conduct a Man-in-the-Middle (MITM) attack. By intercepting the plaintext HTTP request, the attacker can supply an arbitrary, attacker-controlled Root CA certificate. Because the system automatically accepts this certificate and registers it into the local system trust store via update-ca-certificates, this results in system-wide trust store poisoning. Consequently, TLS clients utilizing the operating system trust store on the affected machine will accept rogue certificates for arbitrary domains, enabling persistent decryption and interception of subsequent TLS connections. This issue is resolved in version v0.16.3.

CVSS v3
9.0
EG Score
9.0CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

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
Severity90% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

Published

June 22, 2026

Last Modified

June 22, 2026

Advisory Details (1)

Auto-updated Jun 22, 2026
Patch available. Sources: github_commit.
github_commit Patch Available

commit 8b1939f96d38 (ubuntu/adsys)

Patch available: ubuntu/adsys v0.16.3 (contains commit 8b1939f96d38)

https://github.com/ubuntu/adsys/commit/8b1939f96d3827b4426eb06c1ced5bf317b0a99d

Vendor Advisories for CVE-2026-12249(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/ubuntu/adsys—
  • every version up to 0.16.3-0.20250318112551-8b1939f96d38: fixed in 0.16.3-0.20250318112551-8b1939f96d38
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 29× 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 419 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-12249?
CVE-2026-12249 is a critical vulnerability published on June 22, 2026. An issue was discovered in Canonical ADSys upstream versions through v0.16.2. During Active Directory Certificate Services (AD CS) certificate auto-enrollment via the vendored Samba client script (internal/policies/certificate/python/vendorsamba/gp/gpcertautoenroll_ext.py), ADSys utilizes a…
When was CVE-2026-12249 disclosed?
CVE-2026-12249 was first published on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12249 actively exploited?
CVE-2026-12249 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12249?
CVE-2026-12249 has a CVSS base score of 9.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-12249?
A fix for CVE-2026-12249 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-12249 are linked in the Vendor Advisories panel on this page.

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