Vulnerability from bitnami_vulndb
Published
2026-05-18 05:53
Modified
2026-05-18 06:13
Summary
PostgreSQL discloses MD5-hashed passwords via covert timing channel
Details

Covert timing channel in comparison of MD5-hashed password in PostgreSQL authentication allows an attacker to recover user credentials sufficient to authenticate. This does not affect scram-sha-256 passwords, the default in all supported releases. However, current databases may have MD5-hashed passwords originating in upgrades from PostgreSQL 13 or earlier. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "postgresql",
        "purl": "pkg:bitnami/postgresql"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "14.23.0"
            },
            {
              "introduced": "15.0.0"
            },
            {
              "fixed": "15.18.0"
            },
            {
              "introduced": "16.0.0"
            },
            {
              "fixed": "16.14.0"
            },
            {
              "introduced": "17.0.0"
            },
            {
              "fixed": "17.10.0"
            },
            {
              "introduced": "18.0.0"
            },
            {
              "fixed": "18.4.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-6478"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "Covert timing channel in comparison of MD5-hashed password in PostgreSQL authentication allows an attacker to recover user credentials sufficient to authenticate.  This does not affect scram-sha-256 passwords, the default in all supported releases.  However, current databases may have MD5-hashed passwords originating in upgrades from PostgreSQL 13 or earlier.  Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.",
  "id": "BIT-postgresql-2026-6478",
  "modified": "2026-05-18T06:13:08.477Z",
  "published": "2026-05-18T05:53:06.189Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6478"
    },
    {
      "type": "WEB",
      "url": "https://www.postgresql.org/support/security/CVE-2026-6478/"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "PostgreSQL discloses MD5-hashed passwords via covert timing channel"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.