CVE-2026-6478 (GCVE-0-2026-6478)

Vulnerability from cvelistv5 – Published: 2026-05-14 13:00 – Updated: 2026-07-15 00:41
VLAI
Title
PostgreSQL discloses MD5-hashed passwords via covert timing channel
Summary
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.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
URL Tags
https://www.postgresql.org/support/security/CVE-2…
https://access.redhat.com/security/cve/CVE-2026-6478 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2477447 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:27718 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27743 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27742 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27738 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28999 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28208 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26181 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28143 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34362 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34363 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29815 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:32994 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35880 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34043 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26561 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33497 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29953 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33441 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26524 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29904 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:32983 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26525 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29212 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28037 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26203 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26204 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27741 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21182 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22878 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
n/a PostgreSQL Affected: 18 , < 18.4 (rpm)
Affected: 17 , < 17.10 (rpm)
Affected: 16 , < 16.14 (rpm)
Affected: 15 , < 15.18 (rpm)
Affected: 0 , < 14.23 (rpm)
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:18.4-1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:16.14-1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:16.14-1.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260605152259.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:13.23-2.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260530205218.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260605152256.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260605152253.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 8040020260624104459.522a0ee4 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 8040020260630100922.522a0ee4 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 8040020260624104459.522a0ee4 , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 8040020260630100922.522a0ee4 , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.4
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 8060020260623094704.ad008a3a , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 8060020260625065744.ad008a3a , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 8060020260623094704.ad008a3a , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 8060020260625065744.ad008a3a , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020260615085052.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020260626093604.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:13.23-1.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020260615085052.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020260626093604.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:13.23-1.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 9080020260605131007.rhel9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 9080020260605125734.rhel9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:13.23-3.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 9080020260605124405.rhel9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:13.23-1.el9_2.2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 9020020260625101129.rhel9 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 9040020260612132455.rhel9 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:13.23-1.el9_4.2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 9040020260616071806.rhel9 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 9060020260612084605.rhel9 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:13.23-1.el9_6.2 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 9060020260622062902.rhel9 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Hardened Images Unaffected: 17.10-0.1.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Hardened Images Unaffected: 18.4-0.1.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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Credits
The PostgreSQL project thanks Joe Conway for reporting this problem.
Show details on NVD website

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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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-385\", \"description\": \"Covert Timing Channel\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"victim user has a usable MD5 password\"}], \"providerMetadata\": {\"orgId\": \"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\", \"shortName\": \"PostgreSQL\", \"dateUpdated\": \"2026-05-14T13:00:13.174Z\"}}}",
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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.

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Detection rules are retrieved from Rulezet.

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