CVE-2026-9100
Heap memory out of bounds read and crash in C Driver legacy GridFS file reader
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).
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Heap memory out of bounds read and crash in C Driver legacy GridFS file reader
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).
- Record
CVE-2026-9100- CVSS 4.0
- 6.0 Medium
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 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H - Weakness
- CWE-1285
- Updated
- 2026-11-02
EUVDEUVD-2026-31132
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).
- Record
EUVD-2026-31132- CVSS 4.0
- 6.0 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-87jr-c2qj-3qrg
The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database...
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).
- Record
GHSA-87jr-c2qj-3qrg- CVSS 4.0
- 6.0 Medium
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/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 - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H - Weakness
- CWE-1285
- Updated
- 2026-11-02
NVD
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).
- Record
CVE-2026-9100- CVSS 4.0
- 6.0 Medium
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/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 - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H - CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H - Weakness
- CWE-1285
- Updated
- 2026-11-02
OSVALPINE-CVE-2026-9100
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).
- Record
ALPINE-CVE-2026-9100- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H - Updated
- 2026-11-03
OSV
Heap memory out of bounds read and crash in C Driver legacy GridFS file reader
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).
- Record
CVE-2026-9100- CVSS 4.0
- 6.0 Medium
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 - Weakness
- CWE-1285
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-9100
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).
- Record
DEBIAN-CVE-2026-9100- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-9100
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).
- Record
UBUNTU-CVE-2026-9100- CVSS 4.0
- 6.0 Medium
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 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mongo-c-driverAlpine:v3.24 |
before 1.30.14-r0 | 1.30.14-r0 |
mongo-c-driverDebian:12 |
before 1.23.1-1+deb12u3, plus listed versions 1.23.1-11.23.1-1+deb12u11.23.1-1+deb12u2 |
1.23.1-1+deb12u3 |
mongo-c-driverDebian:13 |
before 1.30.4-1+deb13u2, plus listed versions 1.30.4-11.30.4-1+deb13u1 |
1.30.4-1+deb13u2 |
mongo-c-driverDebian:14 |
before 2.2.4-1, plus listed versions 1.30.4-12.0.2-12.1.0-12.1.1-12.1.2-1 Show 4 moreShow less2.2.0-12.2.1-12.2.2-12.2.3-1 |
2.2.4-1 |
mongo-c-driverUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 1.15.0-11.15.1-11.15.2-11.16.0-11.16.1-11.16.1-1build11.16.1-1build21.16.1-1ubuntu0.1~esm1 |
None known |
mongo-c-driverUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 1.18.0-11.19.1-11.19.2-11.20.0-11.20.0-1build1 Show 4 moreShow less1.20.1-11.21.0-11.21.0-1build11.21.0-1ubuntu0.1~esm1 |
None known |
mongo-c-driverUbuntu:Pro:24.04:LTS |
All versions, plus listed versions 1.24.3-11.24.4-11.25.1-11.25.2-11.25.4-1 Show 4 moreShow less1.26.0-11.26.0-1.1ubuntu11.26.0-1.1ubuntu21.26.0-1.1ubuntu2+esm1 |
None known |
mongo-c-driverUbuntu:25.10 |
All versions, plus listed versions 1.30.2-11.30.4-1ubuntu1 |
None known |
mongo-c-driverUbuntu:26.10 |
All versions, plus listed versions 2.2.2-12.3.1-12.3.2-12.3.3-1build12.5.0-1 |
None known |
mongo-c-driverUbuntu:26.04:LTS |
All versions, plus listed versions 1.30.4-1ubuntu12.2.0-12.2.1-12.2.2-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, references | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-9100 is a medium vulnerability (CVSS 6.0) in Mongodb C Driver, published May 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. Fixed in mongo-c-driver 1.30.14-r0.
References
jira.mongodb.org/browse/CDRIVER-6281
nvd.nist.gov/vuln/detail/CVE-2026-9100
github.com/advisories/GHSA-87jr-c2qj-3qrg
security.alpinelinux.org/vuln/CVE-2026-9100
security-tracker.debian.org/tracker/CVE-2026-9100
ubuntu.com/security/CVE-2026-9100
cve.org/CVERecord?id=CVE-2026-9100