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CVE-2026-120955

MongoDB C Driver Modern GridFS mongoc_gridfs_bucket_download_to_stream() Aborts Application on Malformed GridFS Metadata

8.7 High

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.36%Unchanged since Nov 4, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

MongoDB C Driver Modern GridFS mongoc_gridfs_bucket_download_to_stream() Aborts Application on Malformed GridFS Metadata

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

Record
CVE-2026-120955
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-03
EUVDEUVD-2026-116137 8.7

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

Record
EUVD-2026-116137
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-03
NVD 8.7

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

Record
CVE-2026-120955
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-03
OSVDEBIAN-CVE-2026-120955 8.7

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

Record
DEBIAN-CVE-2026-120955
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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
Updated
2026-11-04
OSVUBUNTU-CVE-2026-120955 8.7

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

Record
UBUNTU-CVE-2026-120955
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-05
OSVopenSUSE-SU-2026:12437-1 No score

bson-devel-2.5.8-1.1 on GA media

These are all security issues fixed in the bson-devel-2.5.8-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12437-1
Updated
2026-11-06

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mongo-c-driver
Debian:12
 All versions, plus listed versions
1.23.1-11.23.1-1+deb12u11.23.1-1+deb12u21.23.1-1+deb12u31.24.1-1
Show 45 moreShow less
1.24.2-11.24.3-11.24.4-11.25.0-11.25.1-11.25.2-11.25.4-11.25.4-1.1~exp11.26.0-11.26.0-1.11.26.0-1.1~exp11.26.1-11.26.2-11.27.0-11.27.1-11.27.2-11.27.3-11.27.4-11.27.5-11.27.6-11.28.0-11.28.1-11.29.0-11.29.1-11.29.2-11.30.0-11.30.1-11.30.2-11.30.3-11.30.4-12.0.2-12.1.0-12.1.1-12.1.2-12.2.0-12.2.1-12.2.2-12.2.3-12.2.4-12.3.0-12.3.1-12.3.2-12.3.3-12.4.0-12.5.0-1
 None known
mongo-c-driver
Debian:13
 All versions, plus listed versions
1.30.4-11.30.4-1+deb13u11.30.4-1+deb13u21.30.4-1+deb13u32.0.2-1
Show 21 moreShow less
2.1.0-12.1.1-12.1.2-12.2.0-12.2.1-12.2.2-12.2.3-12.2.4-12.3.0-12.3.1-12.3.2-12.3.3-12.4.0-12.5.0-12.5.1-12.5.2-12.5.3-12.5.5-12.5.6-12.5.7-12.5.8-1
 None known
mongo-c-driver
Debian:14
 All versions, plus listed versions
1.30.4-12.0.2-12.1.0-12.1.1-12.1.2-1
Show 18 moreShow less
2.2.0-12.2.1-12.2.2-12.2.3-12.2.4-12.3.0-12.3.1-12.3.2-12.3.3-12.4.0-12.5.0-12.5.1-12.5.2-12.5.3-12.5.5-12.5.6-12.5.7-12.5.8-1
 None known
mongo-c-driver
Ubuntu: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-driver
Ubuntu: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 less
1.20.1-11.21.0-11.21.0-1build11.21.0-1ubuntu0.1~esm1
 None known
mongo-c-driver
Ubuntu: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 less
1.26.0-11.26.0-1.1ubuntu11.26.0-1.1ubuntu21.26.0-1.1ubuntu2+esm1
 None known
mongo-c-driver
Ubuntu: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-driver
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.30.4-1ubuntu12.2.0-12.2.1-12.2.2-1
 None known
mongo-c-driver
openSUSE:Tumbleweed
From an advisory covering 5 CVEs
 before 2.5.8-1.1
2.5.8-1.1

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected, aliases, referencesOSV
affected, aliases, referencesCVE List, EUVD, NVD, OSV
aliases, products, publishedEUVD
first indexedCVE List

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-120955 is a high vulnerability (CVSS 8.7) in Mongodb C Driver, published November 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 29th percentile. No source names a fixed version.

References

This page doesn't list everything

Left out here: 7 versions. The JSON record has them.

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