CVE-2026-6478Covert timing channel in comparison of MD5-hashed password in PostgreSQL authentication allows an attacker to recover user credentials sufficient to authenticate.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-385
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Aug 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
postgresql postgresql postgresql:postgresql | before 14.23; from 15.0 before 15.18; from 16.0 before 16.14; from 17.0 before 17.10; from 18.0 before 18.4 | NVD |
References
- https://www.postgresql.org/support/security/CVE-2026-6478/patch, vendor-advisory
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.