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    CVE-2026-6478

    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.

    Published:May 14, 2026
    Last Modified:Aug 25, 2026
    EPS:May 14, 2026
    EPSS Score:0.00558
    CVSS Score:6.5

    Affected Products

    Vendor
    Postgresql
    Product
    Postgresql

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-385 Covert Timing Channel

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-462 Cross-Domain Search Timing

    Related CVEs

    CVE-2026-14671 (CVSS 8.8) — Type confusion in PostgreSQL module "refint" allows an object creator to execute arbitrary code as the operati…
    CVE-2026-6471 (CVSS 7.2) — Missing authorization in PostgreSQL logical decoding allows a non-superuser holding REPLICATION privilege to d…
    CVE-2026-6470 (CVSS 4.3) — Missing authorization in PostgreSQL DDL commands allows an object creator to achieve denial of service against…
    CVE-2026-6469 (CVSS 3.8) — Incorrect ownership assignment in PostgreSQL ALTER TABLE ALTER TYPE command reassigns ownership of dependent s…
    CVE-2026-6464 (CVSS 8.1) — Untrusted data inclusion in PostgreSQL psql COPY may allow a server administrator to elicit execution of data …
    CVE-2026-19385 (CVSS 8.8) — Heap buffer overflow in PostgreSQL pg_dump of long function transform lists allows an object creator to execut…
    CVE-2026-18408 (CVSS 8.8) — Untrusted data inclusion in pg_dump in PostgreSQL allows a malicious superuser of the origin server to inject …
    CVE-2026-18024 (CVSS 4.3) — Buffer over-read in PostgreSQL ascii() SQL function allows a user to disclose up to 3 bytes after the end of a…
    CVE-2026-16241 (CVSS 3.8) — Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of ser…
    CVE-2026-16239 (CVSS 8.8) — Type confusion in PostgreSQL "portal"/cursor lifecycle allows a user to execute arbitrary code as the operatin…

    References

    https://www.postgresql.org/support/security/CVE-2026-6478/
    https://access.redhat.com/errata/RHSA-2026:21182
    https://access.redhat.com/errata/RHSA-2026:22878
    https://access.redhat.com/errata/RHSA-2026:26181
    https://access.redhat.com/errata/RHSA-2026:26203
    https://access.redhat.com/errata/RHSA-2026:26204
    https://access.redhat.com/errata/RHSA-2026:26524
    https://access.redhat.com/errata/RHSA-2026:26525
    https://access.redhat.com/errata/RHSA-2026:26561
    https://access.redhat.com/errata/RHSA-2026:27718
    https://access.redhat.com/errata/RHSA-2026:27738
    https://access.redhat.com/errata/RHSA-2026:27741
    https://access.redhat.com/errata/RHSA-2026:27742
    https://access.redhat.com/errata/RHSA-2026:27743
    https://access.redhat.com/errata/RHSA-2026:28037
    https://access.redhat.com/errata/RHSA-2026:28143
    https://access.redhat.com/errata/RHSA-2026:28208
    https://access.redhat.com/errata/RHSA-2026:28999
    https://access.redhat.com/errata/RHSA-2026:29212
    https://access.redhat.com/errata/RHSA-2026:29815
    https://access.redhat.com/errata/RHSA-2026:29904
    https://access.redhat.com/errata/RHSA-2026:29953
    https://access.redhat.com/errata/RHSA-2026:32983
    https://access.redhat.com/errata/RHSA-2026:32994
    https://access.redhat.com/errata/RHSA-2026:33441
    https://access.redhat.com/errata/RHSA-2026:33497
    https://access.redhat.com/errata/RHSA-2026:34043
    https://access.redhat.com/errata/RHSA-2026:34362
    https://access.redhat.com/errata/RHSA-2026:34363
    https://access.redhat.com/errata/RHSA-2026:35880
    https://access.redhat.com/errata/RHSA-2026:42555
    https://access.redhat.com/errata/RHSA-2026:44420
    https://access.redhat.com/errata/RHSA-2026:44481
    https://access.redhat.com/errata/RHSA-2026:49521
    https://access.redhat.com/errata/RHSA-2026:58981
    https://access.redhat.com/security/cve/CVE-2026-6478
    https://bugzilla.redhat.com/show_bug.cgi?id=2477447
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6478.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High