EUVD-2026-47788Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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
Network-accessible aggregation command requires only low-privilege credentials; complete process termination affecting all clients warrants A:H with no confidentiality or integrity impact.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
3DescriptionCVE.org
An authenticated user with read-only privileges can cause the mongod process to terminate abnormally by issuing a crafted aggregation command, resulting in denial of service for all connected clients until the process is restarted. The issue stems from an internal engine selection inconsistency triggered by a specific combination of aggregation options.
AnalysisAI
MongoDB's mongod daemon can be crashed by any authenticated user holding only read-only privileges, dropping database service for every connected client until an operator restarts the process. The root cause is CWE-617 (Reachable Assertion) inside the aggregation framework's engine selection logic - a state the codebase assumed unreachable that a crafted combination of aggregation options can actually trigger. No public exploit code has been identified at time of analysis and no CISA KEV listing exists, but the PR:L attack vector makes this a reliable insider-threat and post-compromise availability weapon against any network-reachable MongoDB deployment.
Technical ContextAI
The vulnerability lives in the mongod aggregation pipeline execution layer, specifically in the logic that selects between MongoDB's internal query execution engines (such as the classic engine versus the slot-based execution engine introduced in MongoDB 6+). CWE-617 (Reachable Assertion) describes a code path where the developer placed an assertion - a condition assumed invariant - that user-controlled input can violate. When the assertion fires, the runtime terminates the mongod process rather than returning an error to the client, because assertion failures are treated as unrecoverable internal inconsistencies. The CVSS 4.0 input vector AV:N/AC:L/AT:N/PR:L/UI:N confirms the channel is network-based, complexity is low, and no special attack-side preconditions exist. No CPE strings were provided in the input; exact affected version ranges must be obtained from MongoDB JIRA ticket SERVER-128512.
RemediationAI
Consult MongoDB JIRA SERVER-128512 at https://jira.mongodb.org/browse/SERVER-128512 for the official patch release; upgrade to the fixed version as soon as it is published. No exact fix version is confirmed from available data - do not apply a version number from memory or inference. As a compensating control while awaiting the patch, audit and tighten read-only MongoDB role grants: remove aggregation command permissions from roles that do not strictly require them, noting that this may break reporting or analytics integrations that rely on the aggregation pipeline. Configure mongod under a process supervisor (systemd, Kubernetes liveness probe, or similar) with automatic restart to reduce service downtime if the crash is triggered - this does not prevent exploitation but caps the availability window of disruption. Network access controls restricting which hosts can reach the MongoDB port provide an additional defense layer by limiting the pool of accounts that could be used, at the cost of connectivity flexibility.
MongoDB before 2.0.9 and 2.2.x before 2.2.4 does not properly validate requests to the nativeHelper function in SpiderMo
The find prototype in scripting/engine_v8.h in MongoDB 2.4.0 through 2.4.4 allows remote authenticated users to cause a
The MongoDB bson JavaScript module (also known as js-bson) versions 0.5.0 to 1.0.x before 1.0.5 is vulnerable to a Regul
Remote code execution in Chartbrew versions prior to 4.8.1 allows authenticated attackers with high privileges to execut
After user deletion in MongoDB Server the improper invalidation of authorization sessions allows an authenticated user's
The default configuration for MongoDB before 2.3.2 does not validate objects, which allows remote authenticated users to
SimStudio below 0.5.74 has a missing authorization on MongoDB tool endpoints that allows attackers to execute arbitrary
MongoDB Server may access non-initialized region of memory leading to unexpected behaviour when zero arguments are calle
MongoDB Compass may be susceptible to code injection due to insufficient sandbox protection settings with the usage of e
Under certain configurations of --tlsCAFile and tls.CAFile, MongoDB Server may skip peer certificate validation which ma
All versions of bson before 1.1.4 are vulnerable to Deserialization of Untrusted Data. Rated critical severity (CVSS 9.8
Memory corruption in the MongoDB BI Connector ODBC Driver (fixed in v1.4.9) occurs when an oversized catalog, schema, or
Same weakness CWE-617 – Reachable Assertion
View allSame technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today