CVE-2026-9100 PUBLISHED

Heap memory out of bounds read and crash in C Driver legacy GridFS file reader

Assigner: mongodb
Reserved: 20.05.2026 Published: 20.05.2026 Updated: 20.05.2026

The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either crash (via a division-by-zero) or silently leak process memory contents (via an out-of-bounds read).

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
CVSS Score: 5.9

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	MongoDB, Inc.
Product	C Driver
Versions	Default: unaffected affected from 1.0 to 1.30.8 (excl.) affected from 2.0 to 2.2.4 (excl.)

References

https://jira.mongodb.org/browse/CDRIVER-6281

Problem Types

CWE-1285: Improper Validation of Specified Index, Position, or Offset in Input CWE