CVE-2026-106434
Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
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
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Unrecognized payload acceptance in explicit decryption in MongoDB libmongocrypt
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
- Record
CVE-2026-106434- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-354
- Updated
- 2026-11-02
EUVDEUVD-2026-95163
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
- Record
EUVD-2026-95163- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
- Record
CVE-2026-106434- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/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
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-354
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-106434
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
- Record
DEBIAN-CVE-2026-106434- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/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-2026-106434
The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.
- Record
UBUNTU-CVE-2026-106434- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - 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-2026-106434 is a medium vulnerability (CVSS 5.3) 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 0.11%, the 1st percentile. Fixed in libmongocrypt 1.20.5-1.