Medium severity · published Sep 3, 2026
CVE-2026-84968
Heap out-of-bounds read via corrupt nested BSON in field path error message
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver may allow an unauthenticated party who supplies specially formed input to have a small amount of adjacent process memory copied into an error message that is returned to application code. This may result in unintended disclosure of limited memory contents.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
1.15.0 before 1.21.8; 2.0.0 before 2.1.9; 2.2.0 before 2.5.1 · source: vendor
PD
Php Driver · Mongodb
1.15.0 before 1.21.9; 2.0.0 before 2.1.9; 2.2.0 before 2.5.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84968
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84968
Vendor Advisory
https://jira.mongodb.org/browse/PHPC-2744
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