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CriticalFix available

Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure

Type: advisorySource: OSV1 source record

An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to be transmitted in a less-protected form, potentially allowing that credential to be recovered. If recovered, the credential could be used to authenticate as the internal superuser to nodes in the deployment.

Announced Source revision 1
Original source ↗

BIT-mongodb-2026-18691

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:BIT-mongodb-2026-18691

mongodb

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
7.0.40

Source reference: /affected/0/ranges

8.0.29

Source reference: /affected/0/ranges

8.3.8

Source reference: /affected/0/ranges

9.0.2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "7.0.0"
          },
          {
            "fixed": "7.0.40"
          },
          {
            "introduced": "8.0.0"
          },
          {
            "fixed": "8.0.29"
          },
          {
            "introduced": "8.2.0"
          },
          {
            "fixed": "8.3.8"
          },
          {
            "introduced": "9.0.0"
          },
          {
            "fixed": "9.0.2"
          }
        ]
      }
    ],
    "package": {
      "name": "mongodb",
      "purl": "pkg:bitnami/mongodb",
      "ecosystem": "Bitnami"
    },
    "severity": [
      {
        "type": "CVSS_V4",
        "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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"
      }
    ],
    "database_specific": {
      "source": "https://github.com/bitnami/vulndb/tree/main/data/mongodb/BIT-mongodb-2026-18691.json"
    }
  }
]
Related CVEs
CVE-2026-18691

Source reference: /aliases

Publisher severity

critical

Source reference: /database_specific/severity

Event
#59538 · Revision 1
Added to Heist Feed
Publisher date
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