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No exploitation reportedFix available

CVE-2026-106436

Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver

No exploitation reported by the sources we read.

  • Published2026-10-08
  • Fixed in2.5.4 · 2.1.11 · 1.21.1
  • WeaknessCWE-252

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-10-0820:17CVE publishedNVD

Versions per branch

NVD
Mongodb php driver
BranchAffectedFixed in
2.x≥ 2.2.0, < 2.5.42.5.4
2.x≥ 2.0.0, < 2.1.112.1.11
1.x≥ 1.3.0, < 1.21.11.21.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As mongodb, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • MongoDB PHP Driverother versions: not affected
    Affected
    • ≥ 1.3.0, < 1.21.11fixed in 1.21.11semver
    • ≥ 2.0.0, < 2.1.11fixed in 2.1.11semver
    • ≥ 2.2.0, < 2.5.4fixed in 2.5.4semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-08

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • php-mongodbUbuntu:26.10all versions · no fixed version listed
  • php-mongodbUbuntu:26.04:LTSall versions · no fixed version listed
  • php-mongodbUbuntu:24.04:LTSall versions · no fixed version listed
  • php-mongodbUbuntu:22.04:LTSall versions · no fixed version listed
  • php-mongodbUbuntu:20.04:LTSall versions · no fixed version listed
  • php-mongodbUbuntu:18.04:LTSall versions · no fixed version listed
  • php-mongodbUbuntu:16.04:LTSall versions · no fixed version listed
  • php-mongodbDebian:14all versions · fixed in 2.5.5-1

2 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-106436 Red Hat Product Security

    php-pecl-mongodb: php-pecl-mongodb: Denial of Service via oversized BSON encoding

Full record on NVD

Fix

  1. Update Mongodb php driver to 2.5.4 · 2.1.11 · 1.21.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-10-08
  • CNACVSS 4.06.3known since 2026-10-23
  • CNACVSS 3.14.8known since 2026-10-23
  • NVDCVSS 3.16.5read 2026-10-23
  • CNAweakness (CWE)CWE-252known since 2026-10-23
  • FIRST EPSSEPSS score0.3 %2026-11-09
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CVSS 4.0 vector
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
Published
2026-10-08
Last Modified
2026-10-13
NVD status
Analyzed

Frequently asked questions

What is 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.

Is CVE-2026-106436 actively exploited?

Active exploitation of CVE-2026-106436 has not been confirmed. Its EPSS score was 0.3% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-106436?

CVE-2026-106436 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

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