Do Son 
TL;DR
MongoDB fixed 24 MongoDB Server vulnerabilities in recent releases. One critical flaw can leave authorization disabled at startup. Most others cause denial of service, and no in-the-wild exploitation has been confirmed.
- Total: 6 CVEs
- Severity: 1 Critical · 5 High
- Actively exploited: None confirmed
- Highest severity: 9.2 (Critical · CVSSv4) — CVE-2026-82067
- Action: Apply the latest security updates now
Notable CVEs
| CVE | CVSS (CVSSv4) | Type | Fixed in | Status |
|---|---|---|---|---|
| CVE-2026-82067 | 9.2 | Improper Case Sensitivity Handling in Configuration Validation May Cause Authorization to Remain Disabled at Startup | 8.3.9, 8.0.30, 7.0.41 | Not exploited |
| CVE-2026-82075 | 8.7 | Uncontrolled Resource Consumption in Sharded Cluster Router Allows Unauthenticated Denial of Service | 8.3.9, 8.0.30, 7.0.41 | Not exploited |
| CVE-2026-82064 | 8.7 | Unauthenticated Denial of Service in via Assertion Failure in Read Concern Processing on Replica Set Members | 8.3.9, 8.0.30, 7.0.41 | Not exploited |
| CVE-2026-82071 | 7.2 | Insufficient Validation of Storage Engine Configuration Options in Leads to Out-of-Bounds Write | 8.3.9 | Not exploited |
| CVE-2026-82070 | 7.1 | Insufficiently Protected Credentials in Diagnostic Reporting Interface | 8.3.9, 8.0.30, 7.0.41 | Not exploited |
| CVE-2026-82074 | 7.1 | Incorrect Authorization in Aggregation Framework Allows Unauthorized Read Access to Collection Data | 8.0.30, 7.0.41 | Not exploited |
Why these MongoDB Server vulnerabilities matter
MongoDB runs behind countless web and mobile apps. A crash or auth gap there hits every database on the node. These MongoDB Server vulnerabilities span versions 7.0, 8.0, and 8.3.
The worst issue is CVE-2026-82067, rated 9.2. Improper case-sensitivity handling can leave the authorization system disabled at startup. Consequently, an unauthenticated user on the network could run any admin operation.
Two more flaws stand out at 8.7. CVE-2026-82075 lets an unauthenticated client exhaust router CPU. CVE-2026-82064 crashes certain replica set members without any login.
How the attacks work
Most bugs need only a low-privilege account. An authenticated user sends a crafted query, command, or config value. The server then crashes, leaks data, or skips a security check.
Denial of service dominates
More than half of these flaws end in a server crash. Several use-after-free and assertion bugs terminate the mongod process. Worse, some corrupt metadata that persists across restarts. In those cases, an operator must step in to restore service.
Data exposure and authorization gaps
A few issues break access control instead. CVE-2026-82074 and CVE-2026-82073 allow unauthorized reads through the aggregation framework. Meanwhile, CVE-2026-82070 exposes cleartext credentials through a diagnostic interface. CVE-2026-82053 can also assign the wrong LDAP role, granting unintended privileges.
Memory corruption risk
Two bugs go beyond simple crashes. CVE-2026-82071 causes an out-of-bounds write during collection creation. That flaw carries potential for code execution, though a crash is the likely outcome.
Affected versions
The fixes land in three release lines. Affected builds include 8.3.0 before 8.3.9, 8.0.0 before 8.0.30, and 7.0.0 before 7.0.41. Several flaws touch only the newer 8.3 branch. You should confirm your exact build against MongoDB’s advisories.
Patch and mitigation steps
Upgrade now to a fixed release. Move to 8.3.9, 8.0.30, or 7.0.41 as your line requires. Restrict network access to database and router ports as well. Furthermore, review user privileges and drop unused accounts.
Verify that authorization is enabled after every restart. For ongoing notices, subscribe to the official MongoDB security alerts feed. To date, MongoDB has not reported any public proof-of-concept or active exploitation.
The bottom line
These MongoDB Server vulnerabilities are serious but fixable. Patching closes the critical auth bypass and the unauthenticated crashes. Do not wait for attackers to test them first.
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