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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-9740

33
FAUCET Score

A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash the mongod process by sending a specially crafted message. The BSON validator's handling of certain nested binary data structures permits uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking.

First published: Jun 9, 2026Last modified: Jun 9, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.0.0, < 7.0.35CPE matchmatch criteria
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
>= 8.0.0, < 8.0.24CPE matchmatch criteria
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
>= 8.2.0, < 8.2.10CPE matchmatch criteria
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
>= 8.3.0, < 8.3.3CPE matchmatch criteria
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.7HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.34%
Probability of exploitation in next 30 days
EPSS Percentile
27.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0034 is in the 8th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jira.mongodb.org / browse/SERVER-125063
Vendor Advisory