EUVD-2026-72939
GHSA-p5gh-5wmf-x9p2
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:Y/R:A/V:X/RE:X/U:X
Authenticated network attacker controls aggregation input directly, so AC:L; only availability is impacted via process crash, with no confidentiality or integrity effect.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
3DescriptionCVE.org
The $regexFindAll expression can be used by an authenticated user who can run aggregation pipeline stages to crash a MongoDB server (mongod). Under certain specific conditions the regex match can start in the middle of a multi-code-unit character, triggering an assertion during query execution.
Articles & Coverage 1
AnalysisAI
MongoDB Server's $regexFindAll aggregation expression contains a reachable assertion (CWE-617) that any authenticated user with aggregation pipeline execution rights can trigger to crash the mongod process. When a regex match operation begins at a byte offset falling inside a multi-code-unit character - such as a multi-byte UTF-8 sequence or a Unicode surrogate pair - the internal invariant check fires and the database process terminates, causing a full denial of service for all connected clients. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a valid MongoDB user account with at minimum the 'find' privilege and permission to run aggregation pipeline stages against at least one collection (PR:L); (2) the ability to submit $regexFindAll expressions targeting string fields; (3) crafting or injecting input strings containing multi-code-unit Unicode characters (e.g., 4-byte UTF-8 sequences, emoji, or supplementary plane code points) such that the regex engine begins matching at a mid-character byte offset. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VA:H) accurately characterizes the threat: network-accessible, low complexity, low privilege, and fully automatable (AU:Y supplemental metric), with high availability impact and zero confidentiality or integrity impact. … 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 | Consult MongoDB Jira ticket SERVER-124077 (https://jira.mongodb.org/browse/SERVER-124077) for the specific patched release version and upgrade to it as the primary remediation - no exact fix version is independently confirmed from the available input data, so the Jira ticket is the authoritative source. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all MongoDB deployments and identify instances where aggregation pipelines are accessible to standard users; establish temporary restrictions to pipeline execution for non-administrative accounts if operationally feasible. …
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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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