CVE-2026-118383
Critical9.5Pre-authentication use-after-free in MongoDB Server replica set primary catch-uptitle from the CVE record
A use-after-free in the replication component of MongoDB Server can occur when a newly elected replica set primary completes catch-up. The condition can be caused by requests that do not require authentication, and may result in the server terminating unexpectedly or, under certain conditions, arbitrary code execution in the context of the server process. Replica set members are affected, including the shard and config server replica set members of sharded clusters; standalone mongod instances are not.
- CVSS
- 9.5v4.0
- EPSS (exploit probability)
- Unavailable
- CISA KEV
- Not listed
EPSS trendFIRST daily scores, last 90 days
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Learn
Why it happened and what stops it
The weakness (CWE)
How attackers use it (ATT&CK)
Typical for this kind of weakness across CISA KEV exploits (CTID), not specific to this CVE.
How it's exploited
What the attacker gets
Controls that mitigate it (NIST SP 800-53)
- SI-3Malicious Code ProtectionSystem and Information Integrity · mitigates 8 of these techniques
- SI-4System MonitoringSystem and Information Integrity · mitigates 8 of these techniques
- CA-7Continuous MonitoringSecurity Assessment and Authorization · mitigates 7 of these techniques
- AC-4Information Flow EnforcementAccess Control · mitigates 6 of these techniques
- AC-6Least PrivilegeAccess Control · mitigates 6 of these techniques
- AC-2Account ManagementAccess Control · mitigates 5 of these techniques