Vulnerability · Published Sep 3, 2026 · Assigned by mongodb
CVE-2026-84968Heap out-of-bounds read via corrupt nested BSON in field path error message
Medium 5.3
In plain English
A medium-severity out-of-bounds read in PHP Driver from MongoDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver may allow an unauthenticated party who supplies specially formed input to have a small amount of adjacent process memory copied into an error message that is returned to application code. This may result in unintended disclosure of limited memory contents.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | php-mongodb | no fix listed | DEBIAN-CVE-2026-84968 |
| Debian:13 | php-mongodb | 2.0.0-1+deb13u1 | DEBIAN-CVE-2026-84968 |
| Debian:14 | php-mongodb | 2.5.3-1 | DEBIAN-CVE-2026-84968 |
| Ubuntu:22.04:LTS | php-mongodb | no fix listed | UBUNTU-CVE-2026-84968 |
| Ubuntu:24.04:LTS | php-mongodb | no fix listed | UBUNTU-CVE-2026-84968 |
| Ubuntu:26.04:LTS | php-mongodb | no fix listed | UBUNTU-CVE-2026-84968 |
| Ubuntu:26.10 | php-mongodb | no fix listed | UBUNTU-CVE-2026-84968 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | PHP Driver | 1.15.0 – before 1.21.82.0.0 – before 2.1.92.2.0 – before 2.5.1 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N