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CVE-2026-120956

remote abort and memory disclosure from a malformed cursor.ns

7.1 High

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
High

Exploit likelihood

0.25%Unchanged since Nov 4, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

remote abort and memory disclosure from a malformed cursor.ns

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

Record
CVE-2026-120956
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Weakness
CWE-617
Updated
2026-11-03
EUVDEUVD-2026-116135 7.1

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

Record
EUVD-2026-116135
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-03
NVD 7.1

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

Record
CVE-2026-120956
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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
7.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Weakness
CWE-617
Updated
2026-11-03
OSVDEBIAN-CVE-2026-120956 7.1

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

Record
DEBIAN-CVE-2026-120956
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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
Updated
2026-11-04
OSVUBUNTU-CVE-2026-120956 7.1

The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.

Record
UBUNTU-CVE-2026-120956
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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-2026-120956 is a high vulnerability (CVSS 7.1) 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 0.25%, the 16th 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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