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CVE-2026-6811

PHP Stack Exhaustion

HIGH
7.5
CVSS Score
Published: May 14, 2026 at 09:27 PM UTC
Updated: October 26, 2026 at 02:10 PM UTC
1 product affected across 1 vendorPHP Driver

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Stack exhaustion vulnerability in the MongoDB PHP driver can cause application crashes when processing deeply nested BSON documents in unusual circumstances when the source of these BSON documents is not MongoDB Server.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PHP Driver· MongoDB
95%
1.21.0 ≤ v < 1.21.52.1.0 ≤ v < 2.1.81.21.52.1.8
Affected range stops below 1.21.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://jira.mongodb.org/browse/PHPC-2636

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-674

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