CVE-2026-1933 Samba: missing access check on reparse point operations

High 7.1 Published 27 May 2026 Updated 8 Oct 2026

Authenticated users can modify reparse point metadata on read-only Samba shares, altering file behavior despite access restrictions.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-1933?

CVE-2026-1933 is a high-severity missing authorization vulnerability in Redhat Enterprise Linux, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-284

Which versions are affected by CVE-2026-1933?

It affects 3 products.

Products include Redhat Enterprise Linux, Redhat Openshift Container Platform, Samba Samba.

How do I fix CVE-2026-1933?

Apply the vendor's patch.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-1933 being exploited?

There is no known exploitation of CVE-2026-1933 in the wild and no public exploit code.

All Redhat Enterprise Linux vulnerabilities

Sources

Also known as ALPINE-CVE-2026-1933, CLSA-2026-1781350676, DEBIAN-CVE-2026-1933, GHSA-c866-5hw6-cqf9, UBUNTU-CVE-2026-1933.