EUVD-2026-75668
GHSA-38pq-38pp-9f4m
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/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
AC:H captures the two required non-default configuration prerequisites (reactive mode + on-demand KMS); no privilege or user interaction needed; impact is availability-only.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
4DescriptionCVE.org
A use-after-free in the reactive client-side encryption component of the MongoDB Java Driver can cause native resources to be freed while an affected encrypted operation is still using them when the operation is cancelled. A party able to cause such an operation to be cancelled may cause the hosting application process to terminate. Reaching the issue requires an affected reactive encryption configuration that retrieves KMS credentials on demand.
Articles & Coverage 4
AnalysisAI
Use-after-free in the reactive client-side encryption component of the MongoDB Java Driver allows a party that can cancel an in-flight encrypted operation to crash the hosting application process. The flaw surfaces only when the reactive encryption stack is active and KMS credentials are fetched on demand - a specific non-default configuration - making the affected population a subset of all Java Driver deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two non-default configuration prerequisites must both be present: (1) the application must use the reactive (async/non-blocking) client-side encryption API of the MongoDB Java Driver, and (2) the reactive encryption configuration must be set to retrieve KMS credentials on demand rather than using pre-fetched or cached credentials. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H) scores 8.2 but the AT:P (Attack Target: Prerequisite) metric accurately signals that a specific deployment configuration must be in place before any exploitation is possible. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch version has been independently confirmed at time of analysis - the only reference is an internal JIRA ticket (JAVA-6276) which should be monitored for a fix release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory MongoDB Java Driver deployments to identify which versions are in use and whether reactive client-side encryption with on-demand KMS credentials are enabled. …
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External POC / Exploit Code
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