How severe is CVE-2026-6811?

CVE-2026-6811 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-6811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6811?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-6811 have an EU (EUVD) identifier?

Yes. CVE-2026-6811 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30490.

When was CVE-2026-6811 published?

CVE-2026-6811 was published on 2026-05-14 and last updated on 2026-06-17.

CVE-2026-6811

CVE-2026-6811 is a medium-severity vulnerability with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v4: 6.0
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30490
Weakness: CWE-674
Published: 2026-05-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-6811?: 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.
How severe is CVE-2026-6811?: CVE-2026-6811 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-6811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-6811?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6811 have an EU (EUVD) identifier?: Yes. CVE-2026-6811 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30490.
When was CVE-2026-6811 published?: CVE-2026-6811 was published on 2026-05-14 and last updated on 2026-06-17.

References

https://jira.mongodb.org/browse/PHPC-2636

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