RHSA-2026:21182

Vulnerability from csaf_redhat - Published: 2026-05-26 23:31 - Updated: 2026-06-04 04:35
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: postgresql17: * postgresql17-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-contrib-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-docs-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-plperl-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-plpython3-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-pltcl-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-private-devel-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-private-libs-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-server-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-server-devel-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-static-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-test-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-test-rpm-macros-17.10-0.1.hum1 (noarch) * postgresql17-upgrade-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-upgrade-devel-17.10-0.1.hum1 (aarch64, x86_64) * postgresql17-17.10-0.1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-6475

A flaw was found in PostgreSQL. This vulnerability, related to symlink following in pg_basebackup (plain format) and pg_rewind, allows an origin superuser to overwrite local files. By exploiting this, an attacker could potentially hijack the operating system account. This attack has practical implications if specific actions are taken, such as moving files to a different virtual machine (VM) or snapshotting the VM, between the execution of these commands and the server's restart.

6.7 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:postgresql17-main@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:postgresql17-main@noarch —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:postgresql17-main@src —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:postgresql17-main@x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-6477

A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as lo_export(), lo_read(), lo_lseek64(), and lo_tell64(). This allows the superuser to send an arbitrarily large response, overwriting the client's stack memory, specifically in tools like psql and pg_dump. This could lead to arbitrary code execution on the client system.

8.4 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:postgresql17-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:postgresql17-main@noarch —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:postgresql17-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:postgresql17-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-6478

A flaw was found in PostgreSQL. This vulnerability, a covert timing channel, exists in the comparison of MD5-hashed passwords during authentication. A remote attacker could exploit this to recover user credentials, gaining unauthorized access to the database. This issue specifically impacts databases that retain MD5-hashed passwords from upgrades of PostgreSQL 13 or earlier.

8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE-385 - Covert Timing Channel
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:postgresql17-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:postgresql17-main@noarch —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:postgresql17-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:postgresql17-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for Red Hat Hardened Images RPMs is now available.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "This update includes the following RPMs:\n\npostgresql17:\n  * postgresql17-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-contrib-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-docs-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-plperl-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-plpython3-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-pltcl-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-private-devel-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-private-libs-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-server-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-server-devel-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-static-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-test-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-test-rpm-macros-17.10-0.1.hum1 (noarch)\n  * postgresql17-upgrade-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-upgrade-devel-17.10-0.1.hum1 (aarch64, x86_64)\n  * postgresql17-17.10-0.1.hum1.src (src)",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:21182",
        "url": "https://access.redhat.com/errata/RHSA-2026:21182"
      },
      {
        "category": "external",
        "summary": "https://images.redhat.com/",
        "url": "https://images.redhat.com/"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-6478",
        "url": "https://access.redhat.com/security/cve/CVE-2026-6478"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/",
        "url": "https://access.redhat.com/security/updates/classification/"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-6477",
        "url": "https://access.redhat.com/security/cve/CVE-2026-6477"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-6475",
        "url": "https://access.redhat.com/security/cve/CVE-2026-6475"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_21182.json"
      }
    ],
    "title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
    "tracking": {
      "current_release_date": "2026-06-04T04:35:59+00:00",
      "generator": {
        "date": "2026-06-04T04:35:59+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "4.8.1"
        }
      },
      "id": "RHSA-2026:21182",
      "initial_release_date": "2026-05-26T23:31:06+00:00",
      "revision_history": [
        {
          "date": "2026-05-26T23:31:06+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-06-03T20:46:15+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-06-04T04:35:59+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Hardened Images",
                "product": {
                  "name": "Red Hat Hardened Images",
                  "product_id": "Red Hat Hardened Images",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:hummingbird:1"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Hardened Images"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "postgresql17-main@aarch64",
                "product": {
                  "name": "postgresql17-main@aarch64",
                  "product_id": "postgresql17-main@aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/postgresql17@17.10-0.1.hum1?arch=aarch64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-aarch64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "postgresql17-main@src",
                "product": {
                  "name": "postgresql17-main@src",
                  "product_id": "postgresql17-main@src",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/postgresql17@17.10-0.1.hum1?arch=src\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-source-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "src"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "postgresql17-main@x86_64",
                "product": {
                  "name": "postgresql17-main@x86_64",
                  "product_id": "postgresql17-main@x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/postgresql17@17.10-0.1.hum1?arch=x86_64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "postgresql17-main@noarch",
                "product": {
                  "name": "postgresql17-main@noarch",
                  "product_id": "postgresql17-main@noarch",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/postgresql17-test-rpm-macros@17.10-0.1.hum1?arch=noarch\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "noarch"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "postgresql17-main@aarch64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:postgresql17-main@aarch64"
        },
        "product_reference": "postgresql17-main@aarch64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "postgresql17-main@noarch as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:postgresql17-main@noarch"
        },
        "product_reference": "postgresql17-main@noarch",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "postgresql17-main@src as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:postgresql17-main@src"
        },
        "product_reference": "postgresql17-main@src",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "postgresql17-main@x86_64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:postgresql17-main@x86_64"
        },
        "product_reference": "postgresql17-main@x86_64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-6475",
      "cwe": {
        "id": "CWE-59",
        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
      },
      "discovery_date": "2026-05-14T14:01:20.040061+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2477439"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in PostgreSQL. This vulnerability, related to symlink following in pg_basebackup (plain format) and pg_rewind, allows an origin superuser to overwrite local files. By exploiting this, an attacker could potentially hijack the operating system account. This attack has practical implications if specific actions are taken, such as moving files to a different virtual machine (VM) or snapshotting the VM, between the execution of these commands and the server\u0027s restart.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "postgresql: PostgreSQL: Operating system account hijack via symlink following in pg_basebackup and pg_rewind",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This MODERATE symlink following vulnerability in PostgreSQL\u0027s pg_basebackup and pg_rewind allows an origin superuser to overwrite local files. Exploitation requires local access, high privileges (superuser), and specific intermediate actions before server restart. Impact is high to confidentiality, integrity, and availability if exploited. Affects versions before 18.4, 17.10, 16.14, 15.18, and 14.23.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:postgresql17-main@aarch64",
          "Red Hat Hardened Images:postgresql17-main@noarch",
          "Red Hat Hardened Images:postgresql17-main@src",
          "Red Hat Hardened Images:postgresql17-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-6475"
        },
        {
          "category": "external",
          "summary": "RHBZ#2477439",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477439"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-6475",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-6475"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6475",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6475"
        },
        {
          "category": "external",
          "summary": "https://www.postgresql.org/support/security/CVE-2026-6475/",
          "url": "https://www.postgresql.org/support/security/CVE-2026-6475/"
        }
      ],
      "release_date": "2026-05-14T13:00:11.039000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-26T23:31:06+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:21182"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "postgresql: PostgreSQL: Operating system account hijack via symlink following in pg_basebackup and pg_rewind"
    },
    {
      "cve": "CVE-2026-6477",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
      },
      "discovery_date": "2026-05-14T14:01:31.087667+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2477442"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as lo_export(), lo_read(), lo_lseek64(), and lo_tell64(). This allows the superuser to send an arbitrarily large response, overwriting the client\u0027s stack memory, specifically in tools like psql and pg_dump. This could lead to arbitrary code execution on the client system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This IMPORTANT buffer overflow in PostgreSQL libpq allows a malicious server superuser to overwrite client stack memory via lo_* functions. Exploitation requires the victim to connect to a compromised or malicious server (UI:R). The scope is changed as the server attack affects the client system. Impact is high to confidentiality, integrity, and availability through potential client-side code execution. Affects versions before 18.4, 17.10, 16.14, 15.18, and 14.23.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:postgresql17-main@aarch64",
          "Red Hat Hardened Images:postgresql17-main@noarch",
          "Red Hat Hardened Images:postgresql17-main@src",
          "Red Hat Hardened Images:postgresql17-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-6477"
        },
        {
          "category": "external",
          "summary": "RHBZ#2477442",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477442"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-6477",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-6477"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6477",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6477"
        },
        {
          "category": "external",
          "summary": "https://www.postgresql.org/support/security/CVE-2026-6477/",
          "url": "https://www.postgresql.org/support/security/CVE-2026-6477/"
        }
      ],
      "release_date": "2026-05-14T13:00:12.497000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-26T23:31:06+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:21182"
        },
        {
          "category": "workaround",
          "details": "Only connect to trusted PostgreSQL servers. Avoid using psql or pg_dump against untrusted or potentially compromised database servers.",
          "product_ids": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory"
    },
    {
      "cve": "CVE-2026-6478",
      "cwe": {
        "id": "CWE-385",
        "name": "Covert Timing Channel"
      },
      "discovery_date": "2026-05-14T14:01:45.568001+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2477447"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in PostgreSQL. This vulnerability, a covert timing channel, exists in the comparison of MD5-hashed passwords during authentication. A remote attacker could exploit this to recover user credentials, gaining unauthorized access to the database. This issue specifically impacts databases that retain MD5-hashed passwords from upgrades of PostgreSQL 13 or earlier.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:postgresql17-main@aarch64",
          "Red Hat Hardened Images:postgresql17-main@noarch",
          "Red Hat Hardened Images:postgresql17-main@src",
          "Red Hat Hardened Images:postgresql17-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-6478"
        },
        {
          "category": "external",
          "summary": "RHBZ#2477447",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477447"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-6478",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-6478"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6478",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6478"
        },
        {
          "category": "external",
          "summary": "https://www.postgresql.org/support/security/CVE-2026-6478/",
          "url": "https://www.postgresql.org/support/security/CVE-2026-6478/"
        }
      ],
      "release_date": "2026-05-14T13:00:13.174000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-26T23:31:06+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:21182"
        },
        {
          "category": "workaround",
          "details": "To mitigate this vulnerability, ensure that all PostgreSQL user passwords are not hashed using MD5. Users should migrate to stronger hashing algorithms such as `scram-sha-256`. This can be achieved by altering user passwords, which will automatically update their hash to the currently configured default. For example, to change a user\u0027s password: `ALTER USER username WITH PASSWORD \u0027new_password\u0027;` This action will require users to re-authenticate. If a service relies on these credentials, it may require a restart to pick up the new authentication details.",
          "product_ids": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:postgresql17-main@aarch64",
            "Red Hat Hardened Images:postgresql17-main@noarch",
            "Red Hat Hardened Images:postgresql17-main@src",
            "Red Hat Hardened Images:postgresql17-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.