CVE-2026-3012

HIGHNVD 6.88.0▲
EchelonGraph scoreMEDIUM confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 6.8; sources differ by 1.2.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — Patch released this week
8.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.

CVSS v3
6.8
EG Score
8.0(medium)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity80% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

May 27, 2026

Last Modified

August 27, 2026

Advisory Details (4)

Auto-updated Jun 3, 2026
Patch available. Sources: redhat.
generic

16003 – (CVE-2026-3012) [SECURITY] CVE-2026-3012 group policy certificate enrollment uses http:// without validation

https://bugzilla.samba.org/show_bug.cgi?id=16003
redhat Patch Available

2447319 – (CVE-2026-3012) CVE-2026-3012 samba: group policy certificate enrollment uses http:// without validation

Affected: Red Hat Enterprise Linux 8

https://bugzilla.redhat.com/show_bug.cgi?id=2447319
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-3012
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:22644

Vendor Advisories for CVE-2026-3012(12)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinbind (2:4.23.6+dfsg-1ubuntu2.1) @ resolute2026-08-27ubuntu
redhatrhcos-418.94.202608142238-02026-08-26redhat
redhatrhcos-4.19.9.6.202606241344-02026-07-02redhat
redhatsamba-0:4.17.5-105.el9_2.52026-06-23redhat
redhatsamba-0:4.15.5-16.el8_6.12026-06-23redhat
redhatsamba-0:4.17.5-7.el8_8.12026-06-23redhat
redhatsamba-0:4.19.4-105.el9_4.42026-06-23redhat
redhatsamba-0:4.21.3-114.el10_0.12026-06-23redhat
redhatsamba-0:4.21.3-14.el9_6.12026-06-15redhat
redhatsamba-0:4.23.5-10.el9_82026-06-10redhat
redhatsamba-0:4.19.4-16.el8_102026-06-03redhat
redhatsamba-0:4.23.5-109.el10_22026-06-03redhat

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

(6 across 6 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
samba—4.22.10-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
samba—4.23.8-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
samba2:4.13.13+dfsg-1~deb11u1 ... 2:4.13.5+dfsg-2 (8 versions)2:4.13.13+dfsg-1~deb11u8—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
samba2:4.17.10+dfsg-0+deb12u1 ... 2:4.17.9+dfsg-0+deb12u3~bpo11+1 (13 versions)2:4.17.12+dfsg-0+deb12u4—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.3+dfsg-4 ... 2:4.22.8+dfsg-0+deb13u1 (7 versions)2:4.22.8+dfsg-0+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.3+dfsg-4 ... 2:4.24.3+dfsg-1~bpo13+1 (30 versions)2:4.24.3+dfsg-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 21× in last 7d / 122× 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 310 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-3012?
CVE-2026-3012 is a high vulnerability published on May 27, 2026. A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to…
When was CVE-2026-3012 disclosed?
CVE-2026-3012 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3012 actively exploited?
CVE-2026-3012 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 82.4% of all scored CVEs.
What is the CVSS score of CVE-2026-3012?
CVE-2026-3012 has a CVSS v3 base score of 6.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.0.
How do I remediate CVE-2026-3012?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3012, 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-2026-3012

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