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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

MongoDBCVE-2026-18693

MongoDB Server: denial of service

MongoDB

CVE-2026-18693 · Published Aug 11, 2026 · updated Sep 16, 2026

High7.2
Fix: upgrade to 8.3.8 or later (3 fixed versions below)
MongoDB advisory

An issue in MongoDB Server's handling of timeseries collections could allow an authenticated user with write privileges to cause an internal data structure to become inconsistent through certain document insertions. A subsequent insert into the affected bucket could then result in the server accessing memory outside its intended bounds, potentially causing a server crash (denial of service), exposure of limited memory contents, or memory corruption.

Affected versions

PackageAffectedFixed in
MongoDB Server
Product
>= 8.3.0, < 8.3.88.3.8
>= 8.0, < 8.0.298.0.29
>= 7.0, < 7.0.407.0.40
Details and references
CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-787

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