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 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
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
27
EG Risk 27/100

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 (value × EchelonGraph’s weight)
Severity61% × 45%
The EG Score, 6.1 of 10.
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
below the 1st
KEV
Not listed

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.

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

July 15, 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) @ resolute2026-10-01ubuntu

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 ... 2:4.25.0~rc1+dfsg-1 (178 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.10+dfsg-0+deb13u1 ... 2:4.25.0~rc1+dfsg-1 (47 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
samba2:4.22.3+dfsg-4 ... 2:4.25.0~rc1+dfsg-1 (40 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 11× in last 7d / 36× 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 100 of 191 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. None are among the latest 100 rows. The 91 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

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

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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 pamwinbind. When mkhomedir is enabled, pamwinbind 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…
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 July 15, 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 (below the 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.

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