# CVE-2026-2340: Samba: vfs_worm does not block directory modification

> An authenticated user can bypass WORM protections to overwrite protected files via rename operations in Samba's vfs_worm module.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 May 2026
- **Updated:** 15 Oct 2026
- **Also known as:** ALPINE-CVE-2026-2340, AZL-89145, CLSA-2026-1780403538, DEBIAN-CVE-2026-2340, ECHO-8127-8787-df33, GHSA-m6w2-p258-gxqp, MINI-wph4-wvqg-m49w, UBUNTU-CVE-2026-2340

## What is CVE-2026-2340?

CVE-2026-2340 is a medium-severity 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 vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.

Weakness: CWE-280 (Improper Handling of Insufficient Permissions or Privileges)

## Which versions are affected by CVE-2026-2340?

It affects 3 products.


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

## How do I fix CVE-2026-2340?

Apply the vendor's patch.

## Is CVE-2026-2340 being exploited?

There is no known exploitation of CVE-2026-2340 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2018-14667](https://insights.sbomify.com/CVE-2018-14667/): Red Hat JBoss RichFaces Framework Expression Language Injection (critical 9.8, exploited in the wild)
- [CVE-2021-20325](https://insights.sbomify.com/CVE-2021-20325/): Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit (critical 9.8)
- [CVE-2018-25011](https://insights.sbomify.com/CVE-2018-25011/): Memory corruption in libwebp (critical 9.8)
- [CVE-2018-25014](https://insights.sbomify.com/CVE-2018-25014/): Other in libwebp (critical 9.8)
- [CVE-2014-3585](https://insights.sbomify.com/CVE-2014-3585/): Supply chain in redhat-upgrade-tool (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2340 and fix it if it is affected.

What it is: CVE-2026-2340 is a medium-severity 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.
Exploitation: There is no known exploitation of CVE-2026-2340 in the wild and no public exploit code.

Affected product: Redhat Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-2340/ (Markdown: https://insights.sbomify.com/CVE-2026-2340/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2340
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2340
- OSV: https://osv.dev/vulnerability/CVE-2026-2340

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2340/
Summaries are generated and may contain mistakes; the official description above is the record.