7.1

CVE-2026-9748: mongodb Reachable Assertion

CVSS: 7.1v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-9748
Published 09-06-2026Last modified 10-06-2026
Open JSON

Vulnerability summary

CVE-2026-9748 is a high (CVSS 7.1) Reachable Assertion vulnerability in mongodb. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.1% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.57%
0%100%
Low · +0.24 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-06-2026
    PublishedVulnerability first disclosed.
  2. 10-06-2026
    Last modifiedVulnerability information updated.

Description

The $_internalConvertBucketIndexStats stage used PauseExecution as a way to signal "skip this document" when an index stats conversion failed. But PauseExecution is not a general purpose skip mechanism, but rather a TeeBuffer-internal signal used solely by $facet to coordinate its sub-pipelines. When this stage is placed before $facet in a pipeline, TeeBuffer receives the unexpected PauseExecution from upstream and hits a hard invariant assertion, crashing mongod.

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

+0.24 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

Mongodb2 products
  • mongodb≥ 7.0.0, < 7.0.35 | ≥ 8.0.0, < 8.0.10 | ≥ 8.2.0, < 8.2.10 | ≥ 8.3.0, < 8.3.3
  • mongodb server≥ 8.3.0, < 8.3.3 | ≥ 8.2.0, < 8.2.10 | ≥ 8.0.0, < 8.0.10 | ≥ 7.0.0, < 7.0.35
Ubuntu1 product
  • mongodbAll versions (No fix recorded)

2 vendors · 3 products

References

3 links