🛡️ CVE-2026-5170 — mongodb

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-617 OSV

5.0

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Users could trigger a crash of mongod primaries during promotion to sharded

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 this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-5170 is classified as CWE-617: Reachable Assertion. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected software

CVE-2026-5170 is recorded against 1 package.

mongodb

Timeline and source

Published on 6 April 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

jira.mongodb.org (Web)
nvd.nist.gov (Web)

CVE-2026-5170 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Ubuntu

Details

Severity MEDIUM

CVSS Score 5.0

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

CWE CWE-617

Public Exploit ✅ No

Source OSV

Published 2026-04-06

Updated 2026-08-12

Modified 2026-06-17

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

Affected Packages

Software	From version	Fixed in
mongodb	—	—

References

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

WEB https://nvd.nist.gov/vuln/detail/CVE-2026-5170

🔗 NVD 🔗 Mitre ✅ Fix / Advisory

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