CVE-2026-106429
Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
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
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
- Record
CVE-2026-106429- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-191
- Updated
- 2026-11-02
EUVDEUVD-2026-95160
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
- Record
EUVD-2026-95160- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
- Record
CVE-2026-106429- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-191
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-106429
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
- Record
DEBIAN-CVE-2026-106429- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
- 2026-11-02
OSVUBUNTU-CVE-2026-106429
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
- Record
UBUNTU-CVE-2026-106429- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libmongocryptDebian:12 |
All versions, plus listed versions 1.10.0-11.10.1-11.11.0-11.12.0-11.13.0-1 Show 19 moreShow less1.13.1-11.13.2-11.16.0-11.17.0-11.17.3-11.18.1-11.18.2-11.19.0-11.19.1-11.20.0-11.20.1-11.20.2-11.20.3-11.20.4-11.20.5-11.7.2-11.8.2-11.8.4-11.9.1-1 |
None known |
libmongocryptDebian:13 |
All versions, plus listed versions 1.13.2-11.13.2-1+deb13u11.16.0-11.17.0-11.17.3-1 Show 10 moreShow less1.18.1-11.18.2-11.19.0-11.19.1-11.20.0-11.20.1-11.20.2-11.20.3-11.20.4-11.20.5-1 |
None known |
libmongocryptDebian:14 |
before 1.20.5-1, plus listed versions 1.13.2-11.16.0-11.17.0-11.17.3-11.18.1-1 Show 8 moreShow less1.18.2-11.19.0-11.19.1-11.20.0-11.20.1-11.20.2-11.20.3-11.20.4-1 |
1.20.5-1 |
libmongocryptUbuntu:22.04:LTS |
All versions, plus listed versions 1.2.1-11.2.2-11.3.0-11.3.0-1ubuntu1 |
None known |
libmongocryptUbuntu:24.04:LTS |
All versions, plus listed versions 1.7.2-11.8.2-11.8.4-11.8.4-1build21.8.4-1build3 |
None known |
libmongocryptUbuntu:26.10 |
All versions, plus listed versions 1.17.0-11.19.0-11.19.1-11.20.0-11.20.1-1build11.20.2-1 |
None known |
libmongocryptUbuntu:26.04:LTS |
All versions, plus listed versions 1.13.2-11.17.0-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-106429 is a high vulnerability (CVSS 7.1) in Mongodb Libmongocrypt, published October 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. Fixed in libmongocrypt 1.20.5-1.