Is CVE-2026-4359 in the CISA KEV catalog?

No. CVE-2026-4359 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-4359?

CVE-2026-4359 has a CVSS v3 base score of 2.0 (LOW).

What is the EPSS score for CVE-2026-4359?

CVE-2026-4359 has an EPSS score of 0.19% (8th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4359?

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

CVE & CISA-KEV Catalog

CVE-2026-4359

LOW

2.0

CVSS v3

NVD

Description

A compromised third party cloud server or man-in-the-middle attacker could send a malformed HTTP response and cause a crash in applications using the MongoDB C driver.

CWE-158

How to fix

Remediation Available

mongo-c-driverDebian

Fixed in:1.23.1-1+deb12u3CVE-2026-4359

Fixed in:1.30.4-1+deb13u2CVE-2026-4359

Fixed in:2.2.3-1CVE-2026-4359

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 RequiredHigh

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.19%probability of exploitation in 30 days

8thpercentile

Low risk: more likely to be exploited than 8% of all known CVEs.

References

Patch1

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 2026-04-02.