How severe is CVE-2026-9100?

CVE-2026-9100 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2026-9100 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-9100?

CVE-2026-9100 affects Mongodb C Driver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9100?

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

Does CVE-2026-9100 have an EU (EUVD) identifier?

Yes. CVE-2026-9100 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31132.

When was CVE-2026-9100 published?

CVE-2026-9100 was published on 2026-05-20 and last updated on 2026-09-24.

CVE-2026-9100

CVE-2026-9100 is a medium-severity vulnerability in Mongodb C Driver 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-1285.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v4: 6.0
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31132
Weakness: CWE-1285
Affected product: Mongodb C Driver
Published: 2026-05-20
Last modified: 2026-09-24

Description

The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either crash (via a division-by-zero) or silently leak process memory contents (via an out-of-bounds read).

Frequently asked questions

What is CVE-2026-9100?: The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either crash (via a division-by-zero) or silently leak process memory contents (via an out-of-bounds read).
How severe is CVE-2026-9100?: CVE-2026-9100 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2026-9100 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-9100?: CVE-2026-9100 affects Mongodb C Driver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9100?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-9100 have an EU (EUVD) identifier?: Yes. CVE-2026-9100 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31132.
When was CVE-2026-9100 published?: CVE-2026-9100 was published on 2026-05-20 and last updated on 2026-09-24.

References

https://jira.mongodb.org/browse/CDRIVER-6281

Affected products (1)

cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*

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