CVE & CISA-KEV Catalog

CVE-2026-9749

MEDIUM
6.5
CVSS v3
NVD

Description

This issue can occur when running an aggregation pipeline that uses the internal $exchange stage configured with key-range partitioning and order-preserving delivery. If a single key range produces enough documents to fill its exchange buffer (that is, many results are routed to the same consumer), the server reaches the code path where a full per-consumer buffer is detected but the internal "high watermark" for that key range is not updated as intended.

CWE-617

How to fix

Remediation Available
MongoDBWindows application
Affected:8.0.0 8.0.24Fixed in:8.0.24MongoDB Inc.
Affected:8.2.0 8.2.10Fixed in:8.2.10MongoDB Inc.
Affected:8.3.0 8.3.3Fixed in:8.3.3MongoDB Inc.
Affected:7.0.0 7.0.35Fixed in:7.0.35MongoDB Inc.

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

0.27%probability of exploitation in 30 days
19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

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Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-18.