jira.mongodb.org
https://jira.mongodb.org/browse/SERVER-130544 CVE-2026-18709
MEDIUM
Missing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-Shard Data Inconsistency
Record summary
CVE-2026-18709 has a selected CVSS score of 5.9 (medium).
Description
An issue in MongoDB Server could allow an authenticated user with direct network access to a shard to improperly commit or abort an in-progress prepared transaction, bypassing the intended transaction coordination process. This could result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 11, 2026 · Source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
MongoDB ServerBrowse MongoDB / MongoDB ServerDefault status: unaffected | CVE List | 8.3.0 to < 8.3.8 | affected |
| 8.0 to < 8.0.29 | affected | ||
| 7.0 to < 7.0.40 | affected |
References
2nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-18709