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CVE-2026-2340 is an improper access-control flaw in Samba's vfs_worm module, which implements write-once, read-many protections for SMB shares. During a rename operation, the module validated whether the source file remained within its configurable writable grace period but did not validate whether the destination was an existing WORM-protected file. Consequently, a user could create a new file and rename it over a protected destination, replacing content that should have been immutable after the grace period. The issue affects Samba versions since 4.20 when vfs_worm is enabled.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A named vulnerability affecting the listed ZTE CGSL Main Samba-related packages; the content states exploits are available.
A Samba vfs_worm vulnerability where directory modification is not properly blocked.
An authenticated file-overwrite vulnerability in Samba's vfs_worm module that permits a user with write access to a share to bypass WORM protection by renaming a newly created file over a protected file.
An additional Samba vulnerability patched in the same release cycle as CVE-2026-1933; no further details are provided in the content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.