GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-14672 (GCVE-0-2026-14672)

Vulnerability from cvelistv5 – Published: 2026-08-13 13:00 – Updated: 2026-08-29 23:07
VLAI
Title
PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle
Summary
Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count. This requires the probed user to have a non-default scram_iterations count, because the authentication challenge for a nonexistent user reports the default scram_iterations. Within major versions 16-18, minor versions before PostgreSQL 18.6, 17.11, and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:47 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a PostgreSQL Affected: 18 , < 18.6 (rpm)
Affected: 17 , < 17.11 (rpm)
Affected: 16 , < 16.15 (rpm)
Credits
The PostgreSQL project thanks Radim Marek for reporting this problem.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-14672",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-13T14:47:57.245811Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-13T15:35:56.925Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "PostgreSQL",
          "vendor": "n/a",
          "versions": [
            {
              "lessThan": "18.6",
              "status": "affected",
              "version": "18",
              "versionType": "rpm"
            },
            {
              "lessThan": "17.11",
              "status": "affected",
              "version": "17",
              "versionType": "rpm"
            },
            {
              "lessThan": "16.15",
              "status": "affected",
              "version": "16",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "user\u0027s SCRAM verifier has non-default iteration count"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "The PostgreSQL project thanks Radim Marek for reporting this problem."
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count.  This requires the probed user to have a non-default scram_iterations count, because the authentication challenge for a nonexistent user reports the default scram_iterations.  Within major versions 16-18, minor versions before PostgreSQL 18.6, 17.11, and 16.15 are affected.  Versions before PostgreSQL 16 are unaffected."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-204",
              "description": "Observable Response Discrepancy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T23:07:17.450Z",
        "orgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
        "shortName": "PostgreSQL"
      },
      "references": [
        {
          "url": "https://www.postgresql.org/support/security/CVE-2026-14672/"
        }
      ],
      "title": "PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle",
      "x_postgresql": {
        "component": "core server"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007",
    "assignerShortName": "PostgreSQL",
    "cveId": "CVE-2026-14672",
    "datePublished": "2026-08-13T13:00:06.212Z",
    "dateReserved": "2026-07-03T20:28:13.749Z",
    "dateUpdated": "2026-08-29T23:07:17.450Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-14672",
      "date": "2026-09-16",
      "epss": "0.00252",
      "percentile": "0.16788"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T15:01:03.000Z",
      "cve": "CVE-2026-14672",
      "id": "msrc_CVE-2026-14672",
      "initial_release_date": "2026-08-14T19:22:52.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-14672.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-14672\",\"sourceIdentifier\":\"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\",\"published\":\"2026-08-13T13:17:44.653\",\"lastModified\":\"2026-08-29T23:17:14.557\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count.  This requires the probed user to have a non-default scram_iterations count, because the authentication challenge for a nonexistent user reports the default scram_iterations.  Within major versions 16-18, minor versions before PostgreSQL 18.6, 17.11, and 16.15 are affected.  Versions before PostgreSQL 16 are unaffected.\"}],\"affected\":[{\"source\":\"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\",\"affectedData\":[{\"vendor\":\"n/a\",\"product\":\"PostgreSQL\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"18\",\"lessThan\":\"18.6\",\"versionType\":\"rpm\",\"status\":\"affected\"},{\"version\":\"17\",\"lessThan\":\"17.11\",\"versionType\":\"rpm\",\"status\":\"affected\"},{\"version\":\"16\",\"lessThan\":\"16.15\",\"versionType\":\"rpm\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-13T14:47:57.245811Z\",\"id\":\"CVE-2026-14672\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-204\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"14.0\",\"versionEndExcluding\":\"14.24\",\"matchCriteriaId\":\"6BEE5714-C2EF-48DC-8613-C3EAA149E12E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"15.0\",\"versionEndExcluding\":\"15.19\",\"matchCriteriaId\":\"F433746A-733F-4ED0-9913-8AF69E0C8BF2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"16.0\",\"versionEndExcluding\":\"16.15\",\"matchCriteriaId\":\"1996B91F-E0B2-4A78-8788-E17EA68D179C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"17.0\",\"versionEndExcluding\":\"17.11\",\"matchCriteriaId\":\"3D04E642-71D7-4979-AA19-B9CCDEFD8C31\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"18.0\",\"versionEndExcluding\":\"18.5\",\"matchCriteriaId\":\"8494F67B-673A-4E1F-8F40-D24DCC1F8DA4\"}]}]}],\"references\":[{\"url\":\"https://www.postgresql.org/support/security/CVE-2026-14672/\",\"source\":\"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T06:19:49+00:00",
      "cve": "CVE-2026-14672",
      "id": "CVE-2026-14672",
      "initial_release_date": "2026-08-13T13:00:06.212000+00:00",
      "product_status:known_affected": "85",
      "product_status:known_not_affected": "103",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "postgresql: PostgreSQL: User existence oracle in SCRAM authentication",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-14672.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:14:33Z",
      "cve": "CVE-2026-14672",
      "id": "CVE-2026-14672",
      "initial_release_date": "2026-08-14T23:59:52Z",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "926",
      "product_status:recommended": "562",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-14672",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-14672.json",
      "version": "12"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-14672\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-13T14:47:57.245811Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-13T15:35:50.664Z\"}}], \"cna\": {\"title\": \"PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle\", \"credits\": [{\"lang\": \"en\", \"value\": \"The PostgreSQL project thanks Radim Marek for reporting this problem.\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 5.3, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\"}}], \"affected\": [{\"vendor\": \"n/a\", \"product\": \"PostgreSQL\", \"versions\": [{\"status\": \"affected\", \"version\": \"18\", \"lessThan\": \"18.6\", \"versionType\": \"rpm\"}, {\"status\": \"affected\", \"version\": \"17\", \"lessThan\": \"17.11\", \"versionType\": \"rpm\"}, {\"status\": \"affected\", \"version\": \"16\", \"lessThan\": \"16.15\", \"versionType\": \"rpm\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.postgresql.org/support/security/CVE-2026-14672/\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count.  This requires the probed user to have a non-default scram_iterations count, because the authentication challenge for a nonexistent user reports the default scram_iterations.  Within major versions 16-18, minor versions before PostgreSQL 18.6, 17.11, and 16.15 are affected.  Versions before PostgreSQL 16 are unaffected.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-204\", \"description\": \"Observable Response Discrepancy\"}]}], \"x_postgresql\": {\"component\": \"core server\"}, \"configurations\": [{\"lang\": \"en\", \"value\": \"user\u0027s SCRAM verifier has non-default iteration count\"}], \"providerMetadata\": {\"orgId\": \"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\", \"shortName\": \"PostgreSQL\", \"dateUpdated\": \"2026-08-29T23:07:17.450Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-14672\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-29T23:07:17.450Z\", \"dateReserved\": \"2026-07-03T20:28:13.749Z\", \"assignerOrgId\": \"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007\", \"datePublished\": \"2026-08-13T13:00:06.212Z\", \"assignerShortName\": \"PostgreSQL\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.