EUVD-2026-56864
GHSA-q4pc-c9m4-c873
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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
readWrite authentication is explicitly required (PR:L); network delivery via standard MongoDB protocol (AV:N); availability impact is high due to server crash; integrity limited to encrypted index corruption (I:L); no confidentiality impact.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
3DescriptionCVE.org
MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges could submit a specially formed request that leads to a server crash or excessive internal writes, resulting in resource exhaustion and corruption of encrypted index data.
AnalysisAI
Queryable Encryption maintenance operations in MongoDB Server 8.0.x and 8.3.x fail to validate request parameters against the collection's encrypted field configuration due to an integer underflow (CWE-191), allowing an authenticated user with readWrite privileges to crash the server or induce excessive internal writes. The practical impact is availability loss and integrity degradation through corruption of encrypted index data - a particularly damaging outcome given that encrypted index corruption may be non-trivially recoverable. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.
Technical ContextAI
MongoDB's Queryable Encryption (QE) feature allows data to be encrypted client-side with the encrypted fields described in a collection-level EncryptedFieldConfig. Maintenance operations - such as compaction - interact with these configurations to manage encrypted indexes. CWE-191 (Integer Underflow) indicates that the affected code path performs arithmetic on a parameter without adequate bounds checking, likely producing a wrapped or negative value that bypasses downstream validation and drives the server into an unexpected state: either an assertion failure causing process termination or an unbounded write loop causing resource exhaustion. The CPE cpe:2.3:a:mongodb:mongodb_server:*:*:*:*:*:*:*:* confirms this is the MongoDB Server application itself, not a driver or client library. Affected major lines are 8.0 (before 8.0.29) and 8.3.0 (before 8.3.8).
RemediationAI
The primary fix is to upgrade to MongoDB Server 8.0.29 or 8.3.8, the patched releases identified in EUVD-2026-56864. Details of the upstream fix are tracked at https://jira.mongodb.org/browse/SERVER-130628. If immediate upgrade is not possible, a viable compensating control is to restrict readWrite role grants on any collection configured with Queryable Encryption to only trusted, operationally necessary accounts, and to audit existing role assignments for excessive privilege; this reduces the population of accounts that could submit the malformed maintenance request. Disabling Queryable Encryption on collections where it is not strictly required removes exposure entirely, though this has significant cryptographic and operational trade-offs and should not be done without assessment. Network-layer controls (restricting who can reach the MongoDB port) reduce exposure but do not eliminate it for insider-threat scenarios.
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Same weakness CWE-191 – Integer Underflow
View allSame technique Denial Of Service
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External POC / Exploit Code
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