CVE-2026-15779

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreMEDIUM confidence

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

Score 6.1 from GitHub Security Advisory (severity: MODERATE) published 2026-07-15. A secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-44662 (ENISA EUVD) · GHSA-6fmw-7w5g-3pf9 (GitHub Security Advisories)Source: ENISA EUVD

6.1EG
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: 0.1%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts) can have this triggered not only by root, but by a non-root user holding a narrow sudo delegation to run commands as that account, causing ownership of / to change and resulting in severe denial of service (SSH, sudo, and package-manager failures). The change does not grant write access to / (which ships with restrictive 0555 permissions on RHEL), so the impact is availability loss rather than further privilege escalation.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

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)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 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
0.1%
EPSS %ILE
1st
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 (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS. 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, and whom BOD 26-04 binds: 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.

The score's inputs: 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 15, 2026

Last Modified

November 5, 2026

Advisory Details (5)

Auto-updated Jul 15, 2026
Patch available. Sources: redhat.
Web page

nsswitch/pam_winbind.c · samba-4.24.3 · The Samba Team / Samba · GitLab

https://gitlab.com/samba-team/samba/-/blob/samba-4.24.3/nsswitch/pam_winbind.c#L1590
Web page

nsswitch/pam_winbind.c · samba-4.23.5 · The Samba Team / Samba · GitLab

https://gitlab.com/samba-team/samba/-/blob/samba-4.23.5/nsswitch/pam_winbind.c#L1622
Web page

nsswitch/pam_winbind.c · samba-4.19.4 · The Samba Team / Samba · GitLab

https://gitlab.com/samba-team/samba/-/blob/samba-4.19.4/nsswitch/pam_winbind.c
Red HatMentions a patch (unverified)

2499991 – (CVE-2026-15779) CVE-2026-15779 samba-winbind: samba: pam_winbind mkhomedir chowns critical system paths without validation

https://bugzilla.redhat.com/show_bug.cgi?id=2499991
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-15779

Vendor Advisories for CVE-2026-15779(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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinbind (2:4.23.6+dfsg-1ubuntu2.2) @ resolute2026-10-23ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.13.13+dfsg-1 ... 2:4.24.5+dfsg-1~bpo13+1 (245 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.17.10+dfsg-0+deb12u1 ... 2:4.25.1+dfsg-1 (179 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.10+dfsg-0+deb13u1 ... 2:4.25.1+dfsg-1 (48 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.3+dfsg-4 ... 2:4.25.1+dfsg-1 (41 versions)
  • every version on: no fix on record
—

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 6× in last 7d / 28× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 223 rows 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 123 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-11-06 16:36 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  7. 2026-11-05 17:28 UTCEchelonGraph re-scored
  8. 2026-11-05 17:28 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub severity MODERATE · GitHub CVSS 6.1
  9. 2026-11-05 16:49 UTCEchelonGraph re-scored
  10. 2026-11-05 16:49 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub severity MODERATE · GitHub CVSS 6.1
  11. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  12. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  13. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  14. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  15. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  16. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  17. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  18. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  19. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-25 14:47 UTCEchelonGraph re-scored
  22. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  23. 2026-10-23 06:23 UTCEchelonGraph re-scored
  24. 2026-10-23 06:23 UTCVendor advisory
  25. 2026-10-23 06:23 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
Show 75 more
  1. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  2. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  3. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  4. 2026-10-18 04:01 UTCEchelonGraph re-scored
  5. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  6. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  7. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  8. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  9. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  10. 2026-10-12 16:31 UTCEchelonGraph re-scored
  11. 2026-10-11 20:09 UTCEchelonGraph re-scored
  12. 2026-10-11 17:22 UTCEchelonGraph re-scored
  13. 2026-10-11 14:55 UTCEchelonGraph re-scored
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  15. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  16. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  17. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  18. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  19. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  20. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  21. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  22. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  23. 2026-10-01 12:41 UTCEchelonGraph re-scored
  24. 2026-10-01 12:41 UTCVendor advisory
  25. 2026-10-01 12:41 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  26. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  27. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  28. 2026-09-28 08:46 UTCEchelonGraph re-scored
  29. 2026-09-28 08:46 UTCVendor advisory
  30. 2026-09-28 08:46 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  31. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  32. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  33. 2026-09-24 08:54 UTCEchelonGraph re-scored
  34. 2026-09-24 08:54 UTCVendor advisory
  35. 2026-09-24 08:54 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  36. 2026-09-23 03:19 UTCEchelonGraph re-scored
  37. 2026-09-23 03:19 UTCVendor advisory
  38. 2026-09-23 03:19 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  39. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  40. 2026-09-18 04:46 UTCEchelonGraph re-scored
  41. 2026-09-18 04:46 UTCVendor advisory
  42. 2026-09-18 04:46 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  43. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  44. 2026-09-14 07:08 UTCEchelonGraph re-scored
  45. 2026-09-14 07:08 UTCVendor advisory
  46. 2026-09-14 07:08 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  47. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  48. 2026-09-13 07:16 UTCEchelonGraph re-scored
  49. 2026-09-13 07:16 UTCVendor advisory
  50. 2026-09-13 07:16 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  51. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  52. 2026-09-11 21:47 UTCEchelonGraph re-scored
  53. 2026-09-11 21:47 UTCVendor advisory
  54. 2026-09-11 21:47 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  55. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  56. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  58. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  59. 2026-09-08 00:57 UTCEchelonGraph re-scored
  60. 2026-09-08 00:57 UTCVendor advisory
  61. 2026-09-08 00:56 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  62. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  63. 2026-09-05 20:52 UTCEchelonGraph re-scored
  64. 2026-09-05 20:52 UTCVendor advisory
  65. 2026-09-05 20:51 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  66. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  67. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  68. 2026-08-31 03:58 UTCEchelonGraph re-scored
  69. 2026-08-31 03:58 UTCVendor advisory
  70. 2026-08-31 03:58 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  71. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  72. 2026-08-30 03:54 UTCEchelonGraph re-scored
  73. 2026-08-30 03:54 UTCVendor advisory
  74. 2026-08-30 03:54 UTCGHSA enrichmentGHSA-6fmw-7w5g-3pf9 · GitHub CVSS 6.1
  75. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile

Frequently asked(5)

What is CVE-2026-15779?
CVE-2026-15779 is a medium-severity vulnerability; its CVE record was published on July 15, 2026. A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts)…
When was CVE-2026-15779 made public?
CVE-2026-15779 was made public on July 14, 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 July 15, 2026. EchelonGraph's copy of the record carries a last-modified date of November 5, 2026; the record at its source may have been updated since.
Is CVE-2026-15779 actively exploited?
CVE-2026-15779 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15779?
CVE-2026-15779 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15779?
A fix for CVE-2026-15779 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15779 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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