Vulnerability in Samba
CVE-2026-1933
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.009 (56.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Samba
- Red Hat Enterprise Linux 10 — versions 0:4.23.5-109.el10_2
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:4.21.3-114.el10_0.1
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8 — versions 0:4.19.4-16.el8_10
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support — versions 0:4.15.5-16.el8_6.1
- Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On — versions 0:4.15.5-16.el8_6.1
- Red Hat Enterprise Linux 8.8 Telecommunications Update Service — versions 0:4.17.5-7.el8_8.1
- Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions — versions 0:4.17.5-7.el8_8.1
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-1933 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
- bugzilla.samba.org/show_bug.cgi (Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:22963 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:25049 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:25979 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:22644 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:28057 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:28054 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:28055 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-1933?
- CVE-2026-1933 is a high-severity vulnerability in Samba, classified under Improper Access Control. CVSS score: 7.1/10. Published 2026-05-27.
- How severe is CVE-2026-1933?
- High severity. CVSS v3 base score is 7.1 out of 10.