EUVD-2026-86263Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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
AC:H reflects the required control of DNS/host responses (the 4.0 AT:P condition); PR:N/UI:N as no auth or interaction needed; C:N with I:L/A:H since impact is heap corruption causing a crash, not disclosure.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
4DescriptionCVE.org
An out-of-bounds write in the connection-monitoring logic of the MongoDB C Driver may allow an unauthenticated party who controls name resolution and the responses of the hosts named in a client's connection string to write beyond the end of a heap buffer. This may cause the application using the driver to terminate unexpectedly.
Articles & Coverage 2
AnalysisAI
Heap out-of-bounds write in the MongoDB C Driver (libmongoc) allows an unauthenticated attacker who controls DNS resolution and the responses of hosts in a client's connection string to corrupt memory and crash the application. Exploitation requires a privileged network position (MITM or rogue server) and results in denial of service, not code execution or data disclosure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to control name resolution (DNS) for the client AND control the responses of the hosts named in the client's MongoDB connection string - i.e., a privileged network/MITM position or a rogue/compromised server endpoint (this is the AT:P attack requirement). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a heap out-of-bounds write (CWE-787) in the connection-monitoring logic of the MongoDB C Driver (libmongoc), scored by the vendor at CVSS 4.0 8.3 (AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H). … 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 to MongoDB C Driver version 1.30.12 (for 1.x) or 2.5.5 (for 2.x). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, determine whether any in-house or vendor-supplied application links libmongoc by inspecting build manifests, container images, and SBOMs for the 1.x and 2.x driver lines, and for any confirmed install, upgrade to the vendor-released fixes libmongoc 1.30.12 (1.x line) or 2.5.5 (2.x line), rebuilding and redeploying each dependent service; where the upgrade cannot be completed immediately, enforce full TLS certificate verification (tlsCAFile set and tlsAllowInvalidCertificates disabled) and remove SRV/DSN-based host discovery from connection strings to close the DNS-spoofing path. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
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