CVE-2026-9100

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

HIGH
7.1
CVSS Score
Published: May 20, 2026 at 03:55 PM UTC
Updated: September 24, 2026 at 05:47 PM UTC
1 product affected across 1 vendorC++ Driver

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Severity
HIGH7.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1.0 ≤ v < 1.30.81.10.0 ≤ v < 1.30.82.0 ≤ v < 2.2.42.0.0 ≤ v < 2.2.41.02.0
Affected range stops below 1.30.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

Issue TrackingVendor Advisory
Source: cverecord
https://jira.mongodb.org/browse/CDRIVER-6281

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1285

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