How severe is CVE-2026-4358?

CVE-2026-4358 has a CVSS 3.x base score of 6.4, 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 low, and availability high.

Is CVE-2026-4358 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4358?

CVE-2026-4358 affects Mongodb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4358?

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

Does CVE-2026-4358 have an EU (EUVD) identifier?

Yes. CVE-2026-4358 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12639.

When was CVE-2026-4358 published?

CVE-2026-4358 was published on 2026-03-17 and last updated on 2026-06-17.

CVE-2026-4358

CVE-2026-4358 is a medium-severity vulnerability in Mongodb with a CVSS 3.x base score of 6.4. 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-415.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
CVSS v4: 6.1
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12639
Weakness: CWE-415
Affected product: Mongodb
Published: 2026-03-17
Last modified: 2026-06-17

Description

A specially crafted aggregation query with $lookup by an authenticated user with write privileges can cause a double-free or use-after-free memory issue in the slot-based execution (SBE) engine when an in-memory hash table is spilled to disk.

Frequently asked questions

What is CVE-2026-4358?: A specially crafted aggregation query with $lookup by an authenticated user with write privileges can cause a double-free or use-after-free memory issue in the slot-based execution (SBE) engine when an in-memory hash table is spilled to disk.
How severe is CVE-2026-4358?: CVE-2026-4358 has a CVSS 3.x base score of 6.4, 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 low, and availability high.
Is CVE-2026-4358 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4358?: CVE-2026-4358 affects Mongodb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4358?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4358 have an EU (EUVD) identifier?: Yes. CVE-2026-4358 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12639.
When was CVE-2026-4358 published?: CVE-2026-4358 was published on 2026-03-17 and last updated on 2026-06-17.

References

https://jira.mongodb.org/browse/SERVER-118849

Affected products (1)

cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*

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Other CWE-415 (Double Free) vulnerabilities

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CVE-2026-84561 — Critical (CVSS 9.8): A double free issue was addressed with improved memory management. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS…
CVE-2026-77493 — Critical (CVSS 9.8): Double free in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
CVE-2026-64387 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay…
CVE-2026-64386 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query_info() replay…

Browse all CWE-415 (Double Free) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

103.7.41.117 (ipv4-addr)
1.234.27.159 (ipv4-addr)
70.81.127.119 (ipv4-addr)
54.37.10.124 (ipv4-addr)
67.215.227.54 (ipv4-addr)
98.70.52.248 (ipv4-addr)
167.71.60.5 (ipv4-addr)
106.12.70.210 (ipv4-addr)