CVE-2021-20329
Specific cstrings input may not be properly validated in the Go Driver
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Specific cstrings input may not be properly validated in the Go Driver
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.
- Record
CVE-2021-20329- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-1287
- Updated
- 2026-11-02
EUVDEUVD-2021-1314
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.
- Record
EUVD-2021-1314- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f6mq-5m25-4r72
go.mongodb.org/mongo-driver improperly validates cstrings when marshalling Go objects into BSON
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers up to (and including) 1.5.0.
- Record
GHSA-f6mq-5m25-4r72- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-20, CWE-1287
- Updated
- 2026-11-02
NVD
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.
- Record
CVE-2021-20329- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:N/I:P/A:N - Weakness
- CWE-1287, CWE-20
- Updated
- 2026-11-02
OSV
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.
- Record
CVE-2021-20329- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-f6mq-5m25-4r72
go.mongodb.org/mongo-driver improperly validates cstrings when marshalling Go objects into BSON
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers up to (and including) 1.5.0.
- Record
GHSA-f6mq-5m25-4r72- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-1287, CWE-20
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-20329
Specific cstrings input may not be properly validated in the MongoDB Go Driver when marshalling Go objects into BSON. A malicious user could use a Go object with specific string to potentially inject additional fields into marshalled documents. This issue affects all MongoDB GO Drivers prior to and including 1.5.0.
- Record
UBUNTU-CVE-2021-20329- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGO-2021-0112 No score
Improper input validation in go.mongodb.org/mongo-driver
Due to improper input sanitization when marshalling Go objects into BSON, a maliciously constructed Go structure could allow an attacker to inject additional fields into a MongoDB document. Users are affected if they use this package to handle untrusted user input.
- Record
GO-2021-0112- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:15764-1 No score
etcd-for-k8s1.32-3.5.24-1.1 on GA media
These are all security issues fixed in the etcd-for-k8s1.32-3.5.24-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:15764-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
go.mongodb.org/mongo-driverGo |
before 1.5.1 | 1.5.1 |
etcd-for-k8s1.32openSUSE:Tumbleweed From an advisory covering 2 CVEs |
before 3.5.24-1.1 | 3.5.24-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected | ||
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-20329 is a medium vulnerability (CVSS 6.8) in Mongodb Go Driver, published June 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.94%, the 61st percentile. Fixed in go.mongodb.org/mongo-driver 1.5.1.