EUVD-2026-83207
GHSA-6c34-f5wx-m58m
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/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
Remote unauthenticated (PR:N) but reachability requires the app to feed user input into a regex condition on an embedded association, so AC:H; impact is pure availability (A:H).
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
3DescriptionCVE.org
An inefficient regular expression complexity issue in the in-memory query evaluation component of the Mongoid library may allow an unauthenticated party to cause excessive processing within an embedding application process. Applications that place user-supplied text into a pattern-matching query condition on an embedded association may become unresponsive.
AnalysisAI
CPU exhaustion in MongoDB's Mongoid Ruby ODM allows an unauthenticated remote party to render an embedding application unresponsive by supplying crafted text that lands inside a pattern-matching query condition Mongoid evaluates in memory against an embedded association, triggering catastrophic regex backtracking (CWE-1333, ReDoS). The impact is availability-only: the affected Ruby application process burns CPU and stops responding, with no confidentiality or integrity effect. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitable only when the embedding application places attacker-supplied text into a pattern-matching (regex) query condition evaluated against an embedded association through Mongoid's in-memory query evaluation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a CWE-1333 inefficient-regular-expression-complexity (ReDoS) availability issue in Mongoid's in-memory query evaluation. … 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 is identified in the available intelligence - the only reference is the upstream MongoDB Jira issue MONGOID-5981, so track that issue for the fix release and apply the patched Mongoid gem version it names as soon as it ships (do not assume a version number not present in the source data). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Ruby applications using MongoDB Mongoid and identify any code path that passes untrusted text into regex or pattern-matching query conditions on embedded associations; apply immediate interim controls by escaping or allow-listing user input, replacing unbounded regex queries with exact-match or safe anchored patterns, and enforcing query/request timeouts plus CPU and rate limits. …
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External POC / Exploit Code
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