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Description

After invoking $_internalJsEmit, which is not intended to be directly accessible, or mapreduce command’s map function in a certain way, an authenticated user can subsequently crash mongod when the server-side JavaScript engine (through $where, $function, mapreduce reduce stage, etc.) is used also in a specific way, resulting in a post-authentication denial-of-service. This issue impacts MongoDB Server v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.

PUBLISHED Reserved 2026-05-11 | Published 2026-05-13 | Updated 2026-05-15 | Assigner mongodb




HIGH: 7.7CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/AU:N/R:A/V:D/RE:M/U:Red

HIGH: 7.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-416: Use After Free

Product status

Default status
unaffected

8.2 (custom) before 8.2.9
affected

8.3 (custom) before 8.3.2
affected

References

jira.mongodb.org/browse/SERVER-121610 issue-tracking

cve.org (CVE-2026-8336)

nvd.nist.gov (CVE-2026-8336)

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