8.8

CVE-2026-4148: mongodb inc mongodb server Use After Free

CVSS: 8.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-4148
Published 17-03-2026Last modified 18-03-2026
Open JSON

Vulnerability summary

CVE-2026-4148 is a high (CVSS 8.8) Use After Free vulnerability in mongodb inc mongodb server. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.4% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.57%
0%100%
Low · +0.25 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 17-03-2026
    PublishedVulnerability first disclosed.
  2. 18-03-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 3 sources · 2 versions

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

+0.25 pp

From 0.32% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mongodb1 product
  • mongodb≥ 7.0.0, < 7.0.31 | ≥ 8.0.0, < 8.0.20 | ≥ 8.2.0, < 8.2.6 | 8.3.0:alpha0 | 8.3.0:alpha1 | 8.3.0:alpha2 | 8.3.0:alpha3 | 8.3.0:rc1
Mongodb inc1 product
  • mongodb server≥ 8.2, < 8.2.6 | ≥ 8.0, < 8.0.20 | ≥ 7.0, < 7.0.31
Ubuntu1 product
  • mongodbAll versions (No fix recorded)

3 vendors · 3 products

References

3 links