CVE-2026-42809

Full vulnerability record from the local CVENow database.

Description

Apache Polaris can issue broad temporary ("vended") storage credentials during staged table creation before the effective table location has been validated or durably reserved. Those temporary credentials are meant to limit the scope of accessible table data and metadata, but this scope limitation becomes attacker- directed because the attacker can choose a reachable target location. In the confirmed variant, if the caller supplies a custom `location` during stage create and requests credential vending, Apache Polaris uses that location to construct delegated storage credentials immediately. The stage-create path itself neither runs the normal location validation nor the overlap checks before those credentials are issued. Closely related to that, the staged-create flow also accepts `write.data.path` / `write.metadata.path` in the request properties and feeds those location overrides into the same effective table location set used for credential vending. Those fields are secondary to the main custom-`location` exploit, but they are still attacker-influenced location inputs that should be validated before any credentials are issued.

Severity

CRITICAL

CVSS score

9.4 (v4.0)

Vulnerability status

Analyzed

Source identifier

[email protected]

Published

2026-05-04 17:16:26.307000

Last modified

2026-10-26 19:10:00.163000

View original CVE JSON

{
  "id": "CVE-2026-42809",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-04T17:16:26.307",
  "lastModified": "2026-10-26T19:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache Polaris can issue broad temporary (\"vended\") storage credentials during\nstaged\ntable creation before the effective table location has been validated or\ndurably reserved. \nThose temporary credentials are meant to limit the scope\nof\naccessible table data and metadata, but this scope limitation becomes\nattacker-\ndirected because the attacker can choose a reachable target location.\n\n\n\nIn the confirmed variant, if the caller supplies a custom `location` during\nstage create and requests credential vending, Apache Polaris uses that location to\nconstruct delegated storage credentials immediately. The stage-create path\nitself neither runs the normal location validation nor the overlap checks\nbefore those credentials are issued.\n\n\n\nClosely related to that, the staged-create flow also accepts\n`write.data.path` / `write.metadata.path` in the request properties and\nfeeds\nthose location overrides into the same effective table location set used for\ncredential vending. Those fields are secondary to the main custom-`location`\nexploit, but they are still attacker-influenced location inputs that should\nbe\nvalidated before any credentials are issued."
    },
    {
      "lang": "es",
      "value": "Apache Polaris puede emitir credenciales de almacenamiento temporales amplias (’vendidas’) durante la creación de tablas por etapas antes de que la ubicación efectiva de la tabla haya sido validada o reservada de forma duradera. Esas credenciales temporales están destinadas a limitar el alcance de los datos y metadatos de la tabla accesibles, pero esta limitación de alcance se vuelve dirigida por el atacante porque el atacante puede elegir una ubicación de destino alcanzable.\n\nEn la variante confirmada, si el llamador proporciona una ’location’ personalizada durante la creación de la etapa y solicita la emisión de credenciales, Apache Polaris utiliza esa ubicación para construir credenciales de almacenamiento delegadas inmediatamente. La propia ruta de creación de la etapa no ejecuta la validación de ubicación normal ni las comprobaciones de superposición antes de que se emitan esas credenciales.\n\nEstrechamente relacionado con eso, el flujo de creación por etapas también acepta ’write.data.path’ / ’write.metadata.path’ en las propiedades de la solicitud y alimenta esas anulaciones de ubicación en el mismo conjunto de ubicación de tabla efectiva utilizado para la emisión de credenciales. Esos campos son secundarios al exploit principal de ’location’ personalizada, pero siguen siendo entradas de ubicación influenciadas por el atacante que deben validarse antes de que se emitan las credenciales."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Polaris",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.4.1",
              "versionType": "semver",
              "status": "affected"
            }
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        }
      ]
    }
  ],
  "metrics": {
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        "type": "Secondary",
        "cvssData": {
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          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 9.4,
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          "attackVector": "NETWORK",
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          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
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          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
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    "cvssMetricV31": [
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          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
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          "availabilityImpact": "HIGH"
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          "id": "CVE-2026-42809",
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            },
            {
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            },
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          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        }
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  ],
  "configurations": [
    {
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          "negate": false,
          "cpeMatch": [
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  "references": [
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      "url": "https://lists.apache.org/thread/8tfsr8y7pgq6rdcvjx95hkcr47td671r",
      "source": "[email protected]",
      "tags": [
        "Mailing List",
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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}