EUVD-2026-70507
GHSA-pxxc-vwf4-r3mr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Network-reachable via crafted ciphertext with low-privilege write access required; pure availability impact (process termination); no confidentiality or integrity loss.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
4DescriptionCVE.org
Improper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a failed internal check that terminates the process using the library. A party able to place a suitably formed encrypted value where an application will decrypt it, or able to control the responses the application receives, may cause that application to stop running.
AnalysisAI
Process-terminating denial of service in libmongocrypt's decryption path allows a low-privileged attacker to crash applications using MongoDB Client-Side Field Level Encryption (CSFLE). Tracked as MONGOCRYPT-971, the vulnerability is triggered when an unexpected-size encrypted value reaches the decryption routine, firing a reachable assertion (CWE-617) that abruptly terminates the host process rather than returning a handled error. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target application to have MongoDB Client-Side Field Level Encryption (CSFLE) explicitly enabled and to use libmongocrypt for field decryption - deployments not using CSFLE are entirely unaffected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 7.1 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H) accurately reflects an availability-only DoS with low complexity but a low-privilege prerequisite. … 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 | Upgrade libmongocrypt to the fixed version once MongoDB publishes it via MONGOCRYPT-971 (https://jira.mongodb.org/browse/MONGOCRYPT-971); no exact patched version is confirmed in the available data, so the Jira ticket and the mongodb/libmongocrypt GitHub release page should be monitored directly. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Deploy automated dependency scanning to identify all systems using libmongocrypt and implement real-time alerting for unexpected application crashes or restarts. …
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Same weakness CWE-617 – Reachable Assertion
View allSame technique Denial Of Service
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External POC / Exploit Code
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