EUVD-2026-56862
GHSA-4jx5-7652-w3ch
Severity 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-reachable, low-complexity crash requires only a valid credential (PR:L); full process termination warrants A:H, not A:L.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
3DescriptionCVE.org
An issue in MongoDB Server could allow an authenticated user, including one with no assigned privileges, to cause the server process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service.
AnalysisAI
MongoDB Server 8.3.0 through 8.3.7 can be crashed by any authenticated user - including accounts with zero assigned privileges - by submitting a specially crafted aggregation command. The root cause is a reachable assertion (CWE-617) that, when triggered, causes the mongod process to terminate unexpectedly, resulting in a denial of service for all connected clients. No public exploit or active exploitation has been identified at time of analysis, and the vendor has released a patch in version 8.3.8.
Technical ContextAI
CWE-617 (Reachable Assertion) describes a class of defect where attacker-controlled input reaches an internal assertion statement - a runtime invariant check - and causes the process to call abort() or equivalent, terminating immediately without graceful recovery. This is particularly dangerous in database servers because a single malicious aggregation pipeline can crash the entire mongod process, evicting all connected sessions. The affected product is identified by CPE cpe:2.3:a:mongodb:mongodb_server:*:*:*:*:*:*:*:*, scoped to the 8.3.x release line prior to 8.3.8. The MongoDB aggregation framework is a complex query execution engine that processes multi-stage pipelines; assertion guards within it that are reachable via crafted pipeline stages represent a low-complexity attack surface for authenticated users.
RemediationAI
Upgrade MongoDB Server to version 8.3.8 or later, which contains the vendor-released patch for this vulnerability. The fix is tracked in MongoDB's internal issue tracker at https://jira.mongodb.org/browse/SERVER-128482. If immediate upgrade is not feasible, the most actionable compensating control is to restrict access to the aggregation command - either by revoking the 'find' or aggregation-related roles from low-trust accounts, or by enforcing strict role-based access control so that only explicitly trusted service accounts can execute aggregation pipelines. Note that this trade-off may break application functionality if aggregation is used broadly. Network-layer controls (firewall rules restricting mongod port access to known application hosts) reduce exposure from opportunistic authenticated attackers but do not protect against insider threat or compromised application accounts. Patching to 8.3.8 remains the definitive fix.
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Same weakness CWE-617 – Reachable Assertion
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today