CVE-2026-106436
Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
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
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
- Record
CVE-2026-106436- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N - CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-252
- Updated
- 2026-11-02
EUVDEUVD-2026-95236
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
- Record
EUVD-2026-95236- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
- Record
CVE-2026-106436- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/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
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-252
- Updated
- 2026-11-02
OSV
Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
- Record
CVE-2026-106436- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-252
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-106436
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
- Record
DEBIAN-CVE-2026-106436- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-106436
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
- Record
UBUNTU-CVE-2026-106436- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
php-mongodbDebian:12 |
All versions, plus listed versions 1.15.0+1.11.1+1.9.2+1.7.5-11.19.3-11.19.4-21.19.4-3~exp21.19.4-3~exp3 Show 8 moreShow less1.19.4-3~exp41.20.0-11.20.1-11.21.0-12.0.0-12.1.0-12.5.3-12.5.5-1 |
None known |
php-mongodbDebian:13 |
before 2.0.0-1+deb13u2, plus listed versions 2.0.0-12.0.0-1+deb13u1 |
2.0.0-1+deb13u2 |
php-mongodbDebian:14 |
before 2.5.5-1, plus listed versions 2.0.0-12.1.0-12.5.3-1 |
2.5.5-1 |
php-mongodbUbuntu:16.04:LTS |
All versions, plus listed versions 1.1.2-2~ubuntu11.1.5-1~build1 |
None known |
php-mongodbUbuntu:18.04:LTS |
All versions, plus listed versions 1.2.3-1build11.3.4-1build1 |
None known |
php-mongodbUbuntu:20.04:LTS |
All versions, plus listed versions 1.5.5-1build11.6.1-41.6.1-4build1 |
None known |
php-mongodbUbuntu:22.04:LTS |
All versions, plus listed versions 1.9.0+1.7.5-2build21.11.1+1.9.2+1.7.5-41.12.0+1.9.2+1.7.5-31.12.0+1.9.2+1.7.5-4 |
None known |
php-mongodbUbuntu:24.04:LTS |
All versions, plus listed versions 1.15.0+1.11.1+1.9.2+1.7.5-1build11.15.0+1.11.1+1.9.2+1.7.5-1ubuntu11.15.0+1.11.1+1.9.2+1.7.5-1ubuntu21.15.0+1.11.1+1.9.2+1.7.5-1ubuntu3 |
None known |
php-mongodbUbuntu:26.10 |
All versions, plus listed versions 2.1.7-0ubuntu12.1.7-0ubuntu2 |
None known |
php-mongodbUbuntu:26.04:LTS |
All versions, plus listed versions 2.1.0-12.1.7-0ubuntu1 |
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-2026-106436 is a medium vulnerability (CVSS 6.3) in Mongodb Php Driver, published October 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 17th percentile. Fixed in php-mongodb 2.0.0-1+deb13u2.