CVE-2026-2340

MEDIUM

6.5

CVSS v3

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.

CWE-280Improper Handling of Insufficient Permissions

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.13.13+dfsg-1~deb11u8CVE-2026-2340

Fixed in:2:4.17.12+dfsg-0+deb12u4CVE-2026-2340

Fixed in:2:4.22.8+dfsg-0+deb13u2CVE-2026-2340

Fixed in:2:4.24.3+dfsg-1CVE-2026-2340

ctdbRocky

Fixed in:0:4.15.5-16.el8_6.1RHSA-2026:28057

Fixed in:0:4.17.5-7.el8_8.1RHSA-2026:28056

Fixed in:0:4.19.4-105.el9_4.4RHSA-2026:28053

Fixed in:0:4.23.5-10.el9_8RHSA-2026:25049

Fixed in:0:4.19.4-105.el9_4.4RHSA-2026:28053

Fixed in:0:4.17.5-105.el9_2.5RHSA-2026:28054

ctdbRed Hat / RHEL

Fixed in:0:4.15.5-16.el8_6.1RHSA-2026:28057

Fixed in:0:4.17.5-7.el8_8.1RHSA-2026:28056

Fixed in:0:4.23.5-10.el9_8RHSA-2026:25049

Fixed in:0:4.21.3-14.el9_6.1RHSA-2026:25979

Fixed in:0:4.23.5-10.el9_8RHSA-2026:25049

Fixed in:0:4.17.5-105.el9_2.5RHSA-2026:28054

ctdb-debuginfoRocky

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

ctdb-debuginfoRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

ldb-toolsRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

ldb-toolsRocky

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

ldb-tools-debuginfoRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

ldb-tools-debuginfoRocky

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libldbRocky

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libldbRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libldb-debuginfoRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libldb-debuginfoRocky

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libldb-develRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libldb-develRocky

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libnetapiRocky

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libnetapiRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libnetapi-debuginfoRocky

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libnetapi-debuginfoRed Hat / RHEL

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libnetapi-develRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libnetapi-develRocky

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libsmbclientRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libsmbclientRocky

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libsmbclient-debuginfoRocky

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libsmbclient-debuginfoRed Hat / RHEL

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libsmbclient-develRocky

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

libsmbclient-develRed Hat / RHEL

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libwbclientRed Hat / RHEL

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libwbclientRocky

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

libwbclient-debuginfoRocky

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

Fixed in:0:4.23.5-109.el10_2RHSA-2026:22963

Fixed in:0:4.21.3-114.el10_0.1RHSA-2026:28055

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.94%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Vendor Advisory1

bugzilla.samba.org

Mitigation1

access.redhat.com

Third-Party Advisory1

bugzilla.redhat.com

Other references14

Related Vulnerabilities

Other CWE-280 (Improper Handling of Insufficient Permissions) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24116	Critical	9.8	28%	-	-
CVE-2026-20817	High	7.8	5.4%	-	Fix
CVE-2020-8219	High	7.2	2.2%	-	-
CVE-2012-4550	Medium	5.3	2.1%	-	-
CVE-2020-26195	Medium	5.3	1.8%	-	-
CVE-2021-38312	High	7.1	1.3%	-	-

Common questions

How do I fix CVE-2026-2340?

Published advisories record a fix for 125 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-2340 being actively exploited?

Not that we know of. CVE-2026-2340 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.94% is the estimated probability that it will be exploited in the next 30 days. That is higher than 58% of all scored CVEs.

How severe is CVE-2026-2340?

CVE-2026-2340 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-2340 affect?

Published advisories record a fix for samba (Debian), ctdb (Rocky), ctdb (Red Hat / RHEL), ctdb-debuginfo (Rocky), and 121 more. The list on this page is capped, so there may be more.

Embed a live status badge for CVE-2026-2340

Markdown

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HTML

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See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-31.