Is CVE-2026-9100 in the CISA KEV catalog?

No. CVE-2026-9100 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-9100?

CVE-2026-9100 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2026-9100?

CVE-2026-9100 has an EPSS score of 0.28% (20th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-9100?

Upgrade mongo-c-driver on debian 12 to 1.23.1-1+deb12u3 or later.

CVE & CISA-KEV Catalog

CVE-2026-9100

MEDIUM

5.9

CVSS v3

NVD

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).

CWE-1285

How to fix

Remediation Available

mongo-c-driverDebian

Fixed in:1.23.1-1+deb12u3CVE-2026-9100

Fixed in:1.30.4-1+deb13u2CVE-2026-9100

Fixed in:2.2.4-1CVE-2026-9100

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H

Exploit Intelligence

0.28%probability of exploitation in 30 days

20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Other references1

jira.mongodb.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-20.