---
title: "CVE-2026-1933\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-1933?format=md
keywords: index, follow
---

# CVE-2026-1933

Publication date 26 May 2026

Last updated 6 June 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-1933?format=md#impact-score)

Toggle side navigation

## 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.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2026-1933?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| samba | 26.04 LTS resolute | Fixed 2:4.23.6+dfsg-1ubuntu2.1 |
| 25.10 questing | Fixed 2:4.22.3+dfsg-4ubuntu2.4 |
| 24.04 LTS noble | Not affected |
| 22.04 LTS jammy | Not affected |
| 20.04 LTS focal | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

4.21+ only
This only causes users to be able to set or delete the reparse
point xattrs on files that should be read only with
"read only = yes"

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.1 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | Low |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | Low |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.1 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-1933)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-1933)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-1933)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-1933)

### Related Ubuntu Security Notices (USN)

+ [USN-8306-1](https://usn.ubuntu.com/USN-8306-1)
+ Samba vulnerabilities
+ 26 May 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-1933>