6.5

CVE-2026-106436: mongodb php_driver Unchecked Return Value

CVSS: 6.5v3.1MediumAnalyzed
AliasesDEBIAN-CVE-2026-106436UBUNTU-CVE-2026-106436
Published 08-10-2026Last modified 08-10-2026
Open JSON

Vulnerability summary

CVE-2026-106436 is a medium (CVSS 6.5) Unchecked Return Value vulnerability in mongodb php_driver. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.1% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.26%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-10-2026
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

09-10-202619-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • php-mongodbAll versions (No fix recorded)
Mongodb1 product
  • php_driver≥ 1.3.0, < 1.21.11 | ≥ 1.3.0, < 1.21.1 | ≥ 2.0.0, < 2.1.11 | ≥ 2.2.0, < 2.5.4
Ubuntu1 product
  • php-mongodbAll versions (No fix recorded)

3 vendors · 3 products

References

4 links