[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f4V-z7wrzoPHRXe6dlmOKb-F4eWBRiU4z7NKMNvlgau0":3},{"lesson":4},{"id":5,"slug":6,"article_id":7,"title":8,"body":9,"prevention":10,"framework_refs":11,"framework_notes":17,"status":23,"created_at":24,"published_at":25,"article":26,"tags":30,"podcasts":43,"controls":44},"ef074a0e-886d-4d56-85b5-d6efdc5f8ed7","critical-mongodb-crash-bug-exploitable-without-authentication","8da49295-6fa3-4e39-a3aa-d3d9b7393f5b","Critical MongoDB Crash Bug Exploitable Without Authentication","A use-after-free vulnerability in MongoDB's replication code (CVE-2026-118383) allows an unauthenticated attacker to crash a database server with just two crafted ping requests, earning a near-maximum CVSS v4.0 score of 9.5. The flaw targets replica set members, meaning a single successful attack can destabilize an entire database cluster, not just one node. Because no authentication is required, any network-accessible MongoDB instance running an unpatched version is at immediate risk of denial-of-service. This incident underscores how memory-safety bugs in core infrastructure components can have outsized availability consequences, and why rapid patch deployment for critical database systems is non-negotiable.","**Immediate actions:**\n- Upgrade all MongoDB replica set members to the patched version as an emergency change, prioritising internet-facing or network-accessible instances.\n- Restrict network access to MongoDB ports (27017\u002F27018) via firewall rules so only authorised application servers and administrators can reach replica set members.\n- Conduct an immediate inventory of all MongoDB deployments to confirm which versions are running and which are exposed to untrusted networks.\n\n**Long-term improvements:**\n- Integrate MongoDB version and CVE tracking into your vulnerability management platform so critical advisories trigger automatic alerting and SLA-driven remediation workflows.\n- Enforce network segmentation that places database servers in isolated network zones, preventing unauthenticated external access regardless of application-layer vulnerabilities.\n- Establish and rehearse an emergency patching runbook for critical database infrastructure so teams can safely apply urgent patches with minimal downtime.\n\n**Detection measures:**\n- Deploy anomaly-based monitoring on MongoDB replica set traffic to alert on unusual ping patterns or unexpected connection sources indicative of exploitation attempts.\n- Enable MongoDB audit logging and ship logs to a centralised SIEM so crashes, restarts, and abnormal replica set elections are detected and investigated promptly.",[12,13,14,15,16],"CIS Control 7: Continuous Vulnerability Management (v8)","CIS Control 12: Network Infrastructure Management (v8)","NIST SP 800-53 SI-2: Flaw Remediation","NIST CSF 2.0 RS.MI-03: Newly identified vulnerabilities are mitigated or documented as accepted risks","NIS2 Article 21(2)(e)",{"NIS2 Article 21(2)(e)":18,"NIST SP 800-53 SI-2: Flaw Remediation":19,"CIS Control 12: Network Infrastructure Management (v8)":20,"CIS Control 7: Continuous Vulnerability Management (v8)":21,"NIST CSF 2.0 RS.MI-03: Newly identified vulnerabilities are mitigated or documented as accepted risks":22},"NIS2 Article 21(2)(e) requires security in acquisition, development, and maintenance including vulnerability handling, obligating operators of essential services to have processes for rapidly addressing critical flaws in components like MongoDB.","SI-2 mandates identifying, reporting, and correcting system flaws within defined timeframes, directly addressing the need for timely patching of this critical MongoDB vulnerability.","CIS Control 12 calls for restricting network access to only necessary services, which would have prevented unauthenticated external actors from sending ping requests to MongoDB replica set members.","CIS Control 7 requires organisations to continuously assess and remediate vulnerabilities; applying this would have ensured the MongoDB flaw was identified and patched before attackers could exploit it.","This category requires that once a critical vulnerability like CVE-2026-118383 is disclosed, organisations act to mitigate it or formally accept the risk, preventing unpatched systems from remaining exposed.","published","2026-11-12T13:20:58.63174+00:00","2026-11-12T13:20:58.595+00:00",{"id":7,"url":27,"slug":28,"title":29},"https:\u002F\u002Fcybersecuritynews.com\u002Fmongodb-database-crash-vulnerability\u002F","critical-mongodb-flaw-lets-attackers-crash-database-servers-with-just-two-ping-r-f0bcb6","Critical MongoDB Flaw Lets Attackers Crash Database Servers With Just Two Ping Requests",[31,37],{"id":32,"name":33,"slug":34,"description":35,"color":36},"05757c8d-6b93-4194-b35d-7359e7d33b0e","Vulnerability Management","vulnerability-management","Missing scans, no risk prioritization","#fb923c",{"id":38,"name":39,"slug":40,"description":41,"color":42},"af7fce9e-1ce8-4156-93bc-09dcfbfdf29d","Patch Management","patch-management","Unpatched vulnerabilities, delayed updates","#ef4444",[],[45,49,52],{"slug":46,"name":47,"problem":48},"identity-threat-detection","Identity threat detection and response (ITDR)","Attackers who log in with real, stolen credentials get noticed.",{"slug":40,"name":50,"problem":51},"Automated patch management","Known holes get closed in days, not months.",{"slug":53,"name":54,"problem":55},"network-segmentation","Network segmentation and microsegmentation","One compromised machine can no longer reach everything else."]