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MEDIUM

CVE-2026-2340

CVSS v3

6.5

MEDIUM

EPSS Score

0.9 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • sambaAlmaLinux:10all versions · fixed in 4.23.5-109.el10_2and 36 other packages
  • sambaAlmaLinux:9all versions · fixed in 4.23.5-10.el9_8and 36 other packages

Vendor advisories

  • CVE-2026-2340 Red Hat Product Security3,947 products fixed · 59 known affected

    samba: vfs_worm does not block directory modification

    libsmbclient as a component of Red Hat Enterprise Linux 6 · libsmbclient-devel as a component of Red Hat Enterprise Linux 6 · samba as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:77320 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.13.72 bug fix and security update

  • RHSA-2026:70586 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.17.58 bug fix and security update

  • RHSA-2026:67857 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.15.69 bug fix and security update

  • RHSA-2026:65839 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.13.71 bug fix and security update

  • RHSA-2026:65851 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.18.55 bug fix and security update

19 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Published
2026-05-27
Last Modified
2026-07-02

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.

Is CVE-2026-2340 actively exploited?

Active exploitation of CVE-2026-2340 has not been confirmed. Its EPSS score was 0.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-2340?

CVE-2026-2340 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

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