How severe is CVE-2026-5170?

CVE-2026-5170 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-5170 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5170?

CVE-2026-5170 affects Mongodb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5170?

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

Does CVE-2026-5170 have an EU (EUVD) identifier?

Yes. CVE-2026-5170 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17115.

When was CVE-2026-5170 published?

CVE-2026-5170 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-5170

CVE-2026-5170 is a medium-severity vulnerability in Mongodb with a CVSS 3.x base score of 5.3. 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-617.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.0
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17115
Weakness: CWE-617
Affected product: Mongodb
Published: 2026-03-30
Last modified: 2026-06-17

Description

A user with access to the cluster with a limited set of privilege actions can trigger a crash of a mongod process during the limited and unpredictable window when the cluster is being promoted from a replica set to a sharded cluster. This may cause a denial of service by taking down the primary of the replica set. This issue affects MongoDB Server v8.2 versions prior to 8.2.2, MongoDB Server v8.0 versions between 8.0.18, MongoDB Server v7.0 versions between 7.0.31.

Frequently asked questions

What is CVE-2026-5170?: A user with access to the cluster with a limited set of privilege actions can trigger a crash of a mongod process during the limited and unpredictable window when the cluster is being promoted from a replica set to a sharded cluster. This may cause a denial of service by taking down the primary of the replica set. This issue affects MongoDB Server v8.2 versions prior to 8.2.2, MongoDB Server v8.0 versions between 8.0.18, MongoDB Server v7.0 versions between 7.0.31.
How severe is CVE-2026-5170?: CVE-2026-5170 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-5170 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5170?: CVE-2026-5170 affects Mongodb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5170?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5170 have an EU (EUVD) identifier?: Yes. CVE-2026-5170 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17115.
When was CVE-2026-5170 published?: CVE-2026-5170 was published on 2026-03-30 and last updated on 2026-06-17.

References

https://jira.mongodb.org/browse/SERVER-101758

Affected products (1)

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

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Other CWE-617 (Reachable Assertion) vulnerabilities

CVE-2020-3615 — Critical (CVSS 9.8): Valid deauth/disassoc frames is dropped in case if RMF is enabled and some rouge peer keep on sending rogue…
CVE-2019-9795 — Critical (CVSS 9.8): A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by…
CVE-2026-31739 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: crypto: tegra - Add missing CRYPTO_ALG_ASYNC The…
CVE-2020-12417 — High (CVSS 8.8): Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in…
CVE-2020-6623 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
CVE-2020-6619 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__buf_seek.

Browse all CWE-617 (Reachable Assertion) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

1.234.27.159 (ipv4-addr)
103.7.41.117 (ipv4-addr)
167.71.60.5 (ipv4-addr)