CVE-2026-1933

HIGHNVD 6.57.1
EchelonGraph scoreMEDIUM confidence

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

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 6.5; sources differ by 0.6.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
7.1EG
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: 0.9%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in Samba’s handling of NTFS-style reparse points on shares configured with read only = yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write permissions may create or delete reparse point metadata through SMB operations even on read-only exports. This could allow modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types.

CVSS v3
6.5
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

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)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.9% × 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
0.9%
EPSS %ILE
57th
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 (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.9% 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 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: 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.

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

May 27, 2026

Last Modified

October 8, 2026

Advisory Details (5)

Auto-updated Jun 13, 2026
Patch available. Sources: redhat.
Web page

15992 – (CVE-2026-1933) CVE-2026-1933 [SECURITY] Missing access check on reparse point operations

https://bugzilla.samba.org/show_bug.cgi?id=15992
Red HatMentions a patch (unverified)

2447317 – (CVE-2026-1933) CVE-2026-1933 samba: Missing access check on reparse point operations

Affected: Red Hat Enterprise Linux 10

https://bugzilla.redhat.com/show_bug.cgi?id=2447317
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-1933
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:25049
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:22963

Patch Availability(21)

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)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
samba—
  • 4.1.0 up to 4.22.10-r0: fixed in 4.22.10-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
samba—
  • 4.1.0 up to 4.23.8-r0: fixed in 4.23.8-r0
—
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

(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 11× in last 7d / 39× 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 456 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 356 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  2. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  3. 2026-10-18 03:58 UTCEG score recompute
  4. 2026-10-17 17:44 UTCEG score recompute
  5. 2026-10-17 17:44 UTCVendor advisory
  6. 2026-10-17 17:43 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  7. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  8. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  9. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  10. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  11. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  12. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  13. 2026-10-12 16:26 UTCEG score recompute
  14. 2026-10-11 20:06 UTCEG score recompute
  15. 2026-10-11 17:19 UTCEG score recompute
  16. 2026-10-11 14:51 UTCEG score recompute
  17. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  18. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  19. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  20. 2026-10-08 21:21 UTCVendor advisory
  21. 2026-10-08 21:21 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  22. 2026-10-08 20:53 UTCEG score recompute
  23. 2026-10-08 20:53 UTCVendor advisory
  24. 2026-10-08 20:53 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  25. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.9% · 57th percentile
Show 75 more
  1. 2026-10-08 07:24 UTCOSV refresh
  2. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  3. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  4. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  5. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  6. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  7. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  8. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  9. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  10. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  11. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  12. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  13. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  14. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  15. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  16. 2026-09-18 13:18 UTCVendor advisory
  17. 2026-09-18 13:18 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  18. 2026-09-18 12:19 UTCEG score recompute
  19. 2026-09-18 12:19 UTCVendor advisory
  20. 2026-09-18 12:19 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  21. 2026-09-17 19:28 UTCVendor advisory
  22. 2026-09-17 19:28 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  23. 2026-09-17 18:29 UTCEG score recompute
  24. 2026-09-17 18:29 UTCVendor advisory
  25. 2026-09-17 18:29 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  26. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  27. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  28. 2026-09-14 08:53 UTCEG score recompute
  29. 2026-09-14 08:53 UTCVendor advisory
  30. 2026-09-14 08:53 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  31. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  32. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  33. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  34. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  35. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  36. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  37. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  38. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  39. 2026-09-04 13:29 UTCVendor advisory
  40. 2026-09-04 13:29 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  41. 2026-09-04 12:21 UTCEG score recompute
  42. 2026-09-04 12:21 UTCVendor advisory
  43. 2026-09-04 12:21 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  44. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  45. 2026-09-03 15:32 UTCVendor advisory
  46. 2026-09-03 15:32 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  47. 2026-09-03 14:22 UTCVendor advisory
  48. 2026-09-03 14:21 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  49. 2026-09-03 13:19 UTCVendor advisory
  50. 2026-09-03 13:19 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  51. 2026-09-03 12:29 UTCEG score recompute
  52. 2026-09-03 12:29 UTCVendor advisory
  53. 2026-09-03 12:29 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  54. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  55. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  56. 2026-09-01 12:20 UTCEG score recompute
  57. 2026-09-01 12:20 UTCVendor advisory
  58. 2026-09-01 12:20 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  59. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  60. 2026-08-31 18:36 UTCVendor advisory
  61. 2026-08-31 18:36 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  62. 2026-08-31 17:48 UTCVendor advisory
  63. 2026-08-31 17:47 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  64. 2026-08-31 17:24 UTCVendor advisory
  65. 2026-08-31 17:24 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  66. 2026-08-31 17:06 UTCVendor advisory
  67. 2026-08-31 17:06 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  68. 2026-08-31 13:31 UTCVendor advisory
  69. 2026-08-31 13:31 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  70. 2026-08-31 12:30 UTCVendor advisory
  71. 2026-08-31 12:30 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  72. 2026-08-31 03:20 UTCVendor advisory
  73. 2026-08-31 03:20 UTCGHSA enrichmentGHSA-c866-5hw6-cqf9 · GitHub severity HIGH · GitHub CVSS 7.1
  74. 2026-08-31 02:34 UTCEG score recompute
  75. 2026-08-31 02:34 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-1933?
CVE-2026-1933 is a high-severity vulnerability; its CVE record was published on May 27, 2026. A flaw was found in Samba’s handling of NTFS-style reparse points on shares configured with read only = yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write permissions may create or delete reparse point metadata through SMB operations even on read-only…
When was CVE-2026-1933 made public?
CVE-2026-1933 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 8, 2026; the record at its source may have been updated since.
Is CVE-2026-1933 actively exploited?
CVE-2026-1933 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (57th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-1933?
CVE-2026-1933 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.1 (HIGH).
How do I remediate CVE-2026-1933?
A fix for CVE-2026-1933 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-1933 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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