CVE-2026-4148CWE-416

ExpressionContext use-after-free in classic engine $lookup and $graphLookup aggregation operators

High · published March 17, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
46.5
In the wild
Unconfirmed
What it is

A use-after-free vulnerability can be triggered in sharded clusters by an authenticated user with the read role who issues a specially crafted $lookup or $graphLookup aggregation pipeline.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00571 · 46.5th percentile
Weakness
CWE-416 · Use After Free
Published
2026-03-17T15:53Z
EPSS history
Timeline
  • 17 MAR 15:53Z
    ExpressionContext use-after-free in classic engine $lookup and $graphLookup aggregation operators
    cvelistv5