CVE-2026-3012

HIGHNVD 6.88.0
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
8.0EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.8Exploit: None knownExposed services: Not assessed

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
8.0HIGHmedium confidence
EG Risk
36
EG Risk 36/100

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)
Severity80% × 45%
Impact severity (EG Severity): CVSS 8.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.2%
EPSS %ILE
12th
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 (8.0): severity, escalated by confirmed exploitation. This CVE's 8.0 is its impact severity (EG Severity), not escalated.

EG Severity
8.0 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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 low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 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 low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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

May 27, 2026

Last Modified

October 15, 2026

Advisory Details (4)

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

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
Red HatMentions a patch (unverified)

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
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-3012
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

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

Patch Availability(24)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinbind (2:4.19.5+dfsg-4ubuntu9.6) @ noble2026-10-15ubuntu
redhatopenshift/ose-rhel-coreos-9:417.94.202609191027-02026-10-01redhat
redhatopenshift/ose-rhel-coreos-9:415.92.202609140326-02026-09-28redhat
redhatopenshift/ose-rhel-coreos-9:413.92.202609080414-02026-09-17redhat
redhatopenshift/ose-rhel-coreos-8:412.86.202609082051-02026-09-17redhat
redhatopenshift/ose-rhel-coreos-9:418.94.202609031320-02026-09-17redhat
redhatopenshift/ose-rhel-coreos-9:414.92.202609011250-02026-09-14redhat
redhatopenshift/ose-rhel-coreos-9:416.94.202609011112-02026-09-10redhat
redhatopenshift/ose-rhel-coreos-9:417.94.202608250221-02026-09-03redhat
redhatopenshift/ose-rhel-coreos-8:412.86.202608241157-02026-09-03redhat
redhatopenshift/ose-rhel-coreos-9:415.92.202608180329-02026-08-31redhat
redhatopenshift/ose-rhel-coreos-9:416.94.202608150307-02026-08-31redhat
redhatopenshift/ose-rhel-coreos-9:414.92.202608172040-02026-08-31redhat
redhatopenshift/ose-rhel-coreos-9:418.94.202608142238-02026-08-26redhat
redhatopenshift/ose-rhel-coreos-9:4.19.9.6.202606241344-02026-07-02redhat
redhatsamba-0:4.15.5-16.el8_6.12026-06-23redhat
redhatsamba-0:4.21.3-114.el10_0.12026-06-23redhat
redhatsamba-0:4.17.5-105.el9_2.52026-06-23redhat
redhatsamba-0:4.19.4-105.el9_4.42026-06-23redhat
redhatsamba-0:4.17.5-7.el8_8.12026-06-23redhat
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 rangeFix by version rangeDependents
samba—
  • 4.16.0 up to 4.22.10-r0: fixed in 4.22.10-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
samba—
  • 4.16.0 up to 4.23.8-r0: fixed in 4.23.8-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.13.13+dfsg-1~deb11u1 ... 2:4.13.5+dfsg-2 (8 versions)
  • every version up to 2:4.13.13+dfsg-1~deb11u8: fixed in 2:4.13.13+dfsg-1~deb11u8
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.17.10+dfsg-0+deb12u1 ... 2:4.17.9+dfsg-0+deb12u3~bpo11+1 (13 versions)
  • every version up to 2:4.17.12+dfsg-0+deb12u4: fixed in 2:4.17.12+dfsg-0+deb12u4
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.3+dfsg-4 ... 2:4.22.8+dfsg-0+deb13u1 (7 versions)
  • every version up to 2:4.22.8+dfsg-0+deb13u2: fixed in 2:4.22.8+dfsg-0+deb13u2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.3+dfsg-4 ... 2:4.24.3+dfsg-1~bpo13+1 (30 versions)
  • every version up to 2:4.24.3+dfsg-1: fixed in 2:4.24.3+dfsg-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

Data Freshness Timeline

(refreshed 13× in last 7d / 49× 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 99 of 452 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 353 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-18 03:49 UTCEG score recompute
  4. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  6. 2026-10-15 17:28 UTCVendor advisory
  7. 2026-10-15 17:27 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  8. 2026-10-15 16:49 UTCEG score recompute
  9. 2026-10-15 16:49 UTCVendor advisory
  10. 2026-10-15 16:49 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  11. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  13. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-10-12 16:15 UTCEG score recompute
  16. 2026-10-11 19:58 UTCEG score recompute
  17. 2026-10-11 17:11 UTCEG score recompute
  18. 2026-10-11 14:40 UTCEG score recompute
  19. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-10-08 21:21 UTCVendor advisory
  23. 2026-10-08 21:21 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  24. 2026-10-08 21:04 UTCEG score recompute
  25. 2026-10-08 21:04 UTCVendor advisory
Show 74 more
  1. 2026-10-08 21:03 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  2. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  4. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  6. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  7. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  8. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-10-01 17:28 UTCVendor advisory
  10. 2026-10-01 17:28 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  11. 2026-10-01 16:47 UTCEG score recompute
  12. 2026-10-01 16:47 UTCVendor advisory
  13. 2026-10-01 16:46 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-09-28 02:19 UTCVendor advisory
  17. 2026-09-28 02:19 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  18. 2026-09-28 02:12 UTCEG score recompute
  19. 2026-09-28 02:12 UTCVendor advisory
  20. 2026-09-28 02:12 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  23. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  26. 2026-09-18 13:23 UTCVendor advisory
  27. 2026-09-18 13:23 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  28. 2026-09-18 12:19 UTCEG score recompute
  29. 2026-09-18 12:19 UTCVendor advisory
  30. 2026-09-18 12:19 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  31. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  32. 2026-09-17 19:28 UTCVendor advisory
  33. 2026-09-17 19:28 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  34. 2026-09-17 18:29 UTCVendor advisory
  35. 2026-09-17 18:29 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  36. 2026-09-17 12:20 UTCVendor advisory
  37. 2026-09-17 12:20 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  38. 2026-09-17 12:11 UTCVendor advisory
  39. 2026-09-17 12:11 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  40. 2026-09-17 11:49 UTCVendor advisory
  41. 2026-09-17 11:49 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  42. 2026-09-17 08:29 UTCVendor advisory
  43. 2026-09-17 08:29 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  44. 2026-09-17 08:09 UTCEG score recompute
  45. 2026-09-17 08:09 UTCVendor advisory
  46. 2026-09-17 08:09 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  47. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  48. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  49. 2026-09-15 12:30 UTCVendor advisory
  50. 2026-09-15 12:30 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  51. 2026-09-15 12:14 UTCEG score recompute
  52. 2026-09-15 12:14 UTCVendor advisory
  53. 2026-09-15 12:13 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  54. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  55. 2026-09-14 13:38 UTCVendor advisory
  56. 2026-09-14 13:38 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  57. 2026-09-14 13:11 UTCVendor advisory
  58. 2026-09-14 13:11 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  59. 2026-09-14 09:24 UTCEG score recompute
  60. 2026-09-14 09:24 UTCVendor advisory
  61. 2026-09-14 09:24 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  62. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  63. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  64. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  65. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  66. 2026-09-10 13:38 UTCVendor advisory
  67. 2026-09-10 13:38 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  68. 2026-09-10 12:26 UTCVendor advisory
  69. 2026-09-10 12:26 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  70. 2026-09-10 10:38 UTCEG score recompute
  71. 2026-09-10 10:38 UTCVendor advisory
  72. 2026-09-10 10:38 UTCGHSA enrichmentGHSA-59rx-q76w-hqrw · GitHub severity HIGH · GitHub CVSS 8.0
  73. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  74. 2026-09-10 09:32 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-3012?
CVE-2026-3012 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-3012 was made public on May 27, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on May 27, 2026. EchelonGraph's copy of the record carries a last-modified date of October 15, 2026; the record at its source may have been updated since.
Is CVE-2026-3012 actively exploited?
CVE-2026-3012 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-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 (HIGH).
How do I remediate CVE-2026-3012?
A fix for CVE-2026-3012 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-3012 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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