CVE-2026-6478 (GCVE-0-2026-6478)
Vulnerability from cvelistv5 – Published: 2026-05-14 13:00 – Updated: 2026-06-30 12:06
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.
Severity
6.5 (Medium)
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-385 - Covert Timing Channel
Assigner
References
28 references
Impacted products
21 products
Credits
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This issue specifically impacts databases that retain MD5-hashed passwords from upgrades of PostgreSQL 13 or earlier.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-385\", \"description\": \"Covert Timing Channel\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-06-30T03:16:08.056Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-6478\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-14T15:32:42.868340Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-14T15:32:49.316Z\"}}], \"cna\": {\"title\": \"PostgreSQL discloses MD5-hashed passwords via covert timing channel\", \"credits\": [{\"lang\": \"en\", \"value\": \"The PostgreSQL project thanks Joe Conway for reporting this problem.\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 6.5, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N\"}}], \"affected\": [{\"vendor\": \"n/a\", \"product\": \"PostgreSQL\", \"versions\": [{\"status\": \"affected\", \"version\": \"18\", \"lessThan\": \"18.4\", \"versionType\": \"rpm\"}, {\"status\": \"affected\", \"version\": \"17\", \"lessThan\": \"17.10\", \"versionType\": \"rpm\"}, {\"status\": \"affected\", \"version\": \"16\", \"lessThan\": \"16.14\", \"versionType\": \"rpm\"}, {\"status\": \"affected\", \"version\": \"15\", \"lessThan\": \"15.18\", \"versionType\": \"rpm\"}, {\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"14.23\", \"versionType\": \"rpm\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.postgresql.org/support/security/CVE-2026-6478/\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"reset password with password_encryption=scram-sha-256\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"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\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-6478\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-30T03:16:08.056Z\", \"dateReserved\": \"2026-04-17T00:44:57.549Z\", \"assignerOrgId\": \"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\", \"datePublished\": \"2026-05-14T13:00:13.174Z\", \"assignerShortName\": \"PostgreSQL\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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