CVE-2026-9749
HIGH EPSS 18.5%
Published Jun 9, 20262w ago · Modified Jun 18, 20261w ago
7.1 CVSS 4.0
Published Jun 9, 2026 2w ago
Last Modified Jun 18, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
18.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-617
Affected Products 4
References 1
- jira.mongodb.org https://jira.mongodb.org/browse/SERVER-124031
Remediation
- jira.mongodb.org https://jira.mongodb.org/browse/SERVER-124031