Low severity · published Mar 17, 2026
CVE-2026-4359
Heap-buffer-over-read in _mongoc_http_send via strstr on non-null-terminated buffer
3.7
CVSS
0.2%
EPSS
No
On KEV
Description
A compromised third party cloud server or man-in-the-middle attacker could send a malformed HTTP response and cause a crash in applications using the MongoDB C driver.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
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
MC
MongoDB C Driver · MongoDB Inc
before 2.2.3 · source: vendor
CD
C Driver · Mongodb
before 1.30.8; 2.2.0 before 2.2.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4359
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4359
Patch
https://jira.mongodb.org/browse/CDRIVER-6251
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