CVE-2026-2340: samba — Fix

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.

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CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0055

Probability of exploitation

0.41%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-280 CWE-280

Affected Products

Vendor	Product	Versions
redhat	openshift_container_platform	All
samba	samba	>= 4.1.0
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All

References

Advisories & Patches

https://bugzilla.samba.org/show_bug.cgi?id=15997

Other References

https://access.redhat.com/security/cve/CVE-2026-2340 https://bugzilla.redhat.com/show_bug.cgi?id=2447318

Frequently Asked Questions

What is CVE-2026-2340? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-2340? +

CVE-2026-2340 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0055, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-2340? +

CVE-2026-2340 affects products from redhat, samba, specifically: enterprise_linux, openshift_container_platform, samba. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-2340? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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