CVE-2026-9747: CWE-617 Reachable assertion in MongoDB MongoDB Server
CVE-2026-9747 is a high-severity vulnerability in MongoDB Server where adding the parameters fromRouter:true and runtimeConstants.userRoles can cause aggregation operations to crash the server. This is due to a reachable assertion issue classified under CWE-617. The vulnerability affects specific versions of MongoDB Server including 7.0.0, 8.0.0, 8.2.0, and 8.3.0. No official patch or remediation guidance has been provided yet.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-9747) in MongoDB Server involves a reachable assertion triggered by the addition of fromRouter:true and runtimeConstants.userRoles during aggregation operations. This causes the MongoDB server to crash, impacting availability. The issue is categorized under CWE-617 (Reachable Assertion). The CVSS 4.0 base score is 7.1, indicating high severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. Affected versions explicitly include 7.0.0, 8.0.0, 8.2.0, and 8.3.0. There is no vendor advisory or patch information available at this time.
Potential Impact
Successful exploitation of this vulnerability results in a denial of service condition by crashing the MongoDB server during aggregation queries that include the specified parameters. This impacts the availability of the database service. There is no indication of data confidentiality or integrity being affected. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, avoid using aggregation queries that include fromRouter:true and runtimeConstants.userRoles parameters to prevent triggering the crash.
CVE-2026-9747: CWE-617 Reachable assertion in MongoDB MongoDB Server
Description
CVE-2026-9747 is a high-severity vulnerability in MongoDB Server where adding the parameters fromRouter:true and runtimeConstants.userRoles can cause aggregation operations to crash the server. This is due to a reachable assertion issue classified under CWE-617. The vulnerability affects specific versions of MongoDB Server including 7.0.0, 8.0.0, 8.2.0, and 8.3.0. No official patch or remediation guidance has been provided yet.
CVSS v4.0
Score 7.1high
Affected software
pkg:github/mongodb/mongoRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-9747) in MongoDB Server involves a reachable assertion triggered by the addition of fromRouter:true and runtimeConstants.userRoles during aggregation operations. This causes the MongoDB server to crash, impacting availability. The issue is categorized under CWE-617 (Reachable Assertion). The CVSS 4.0 base score is 7.1, indicating high severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. Affected versions explicitly include 7.0.0, 8.0.0, 8.2.0, and 8.3.0. There is no vendor advisory or patch information available at this time.
Potential Impact
Successful exploitation of this vulnerability results in a denial of service condition by crashing the MongoDB server during aggregation queries that include the specified parameters. This impacts the availability of the database service. There is no indication of data confidentiality or integrity being affected. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, avoid using aggregation queries that include fromRouter:true and runtimeConstants.userRoles parameters to prevent triggering the crash.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-05-27T17:46:34.140Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2892f48dd33fbd858e3b41
Added to database: 06/09/2026, 22:25:56 UTC
Last enriched: 06/17/2026, 09:21:42 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 100
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.