CVE-2026-82726 (GCVE-0-2026-82726)
Vulnerability from cvelistv5
Published
2026-08-31 03:05
Modified
2026-08-31 14:47
CWE
  • CWE-625 - Permissive Regular Expression
  • CWE-178 - Improper Handling of Case Sensitivity
Summary
Permissive Regular Expression vulnerability in ash-project ash_phoenix lets a remote client select the tenant an Ash application uses, or degrade the request, by sending a crafted Host header. AshPhoenix.Helpers.get_subdomain/2 stripped the root domain with String.replace(host, ~r/.?#{root_host}/, ""). The root host was interpolated raw, so each . became a wildcard and any metacharacter a pattern, and the replace was global and unanchored, so a match was removed from anywhere in the string. With root_host example.com, Host: foo.exampleXcom.attacker.net returned the tenant foo.attacker.net. A metacharacter-bearing or nil root host degraded the pattern or raised on every request. The comparison was also case-sensitive, so TENANT.EXAMPLE.COM and EXAMPLE.COM slipped past the root-host allowlist. conn.host comes from the client Host header. The fix matches the root host case-insensitively and only as an exact trailing suffix. This issue affects ash_phoenix: from 2.1.26 before 2.3.25.
Impacted products
Vendor Product Version
ash-project ash_phoenix Version: 2.1.26   
    cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*
Create a notification for this product.
   ash-project ash_phoenix Version: 9a5ea4d377bc263de321d79574872a3dfc4fb541
    cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website


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The comparison was also case-sensitive, so `TENANT.EXAMPLE.COM` and `EXAMPLE.COM` slipped past the root-host allowlist. `conn.host` comes from the client `Host` header. The fix matches the root host case-insensitively and only as an exact trailing suffix.\\n\\nThis issue affects ash_phoenix: from 2.1.26 before 2.3.25.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-625\", \"description\": \"CWE-625 Permissive Regular Expression\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-178\", \"description\": \"CWE-178 Improper Handling of Case Sensitivity\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The application uses subdomain-based multitenancy via AshPhoenix.Helpers.get_subdomain/2 (for example through AshPhoenix.LiveView.SubdomainHook) to select the tenant from the request host.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe application uses subdomain-based multitenancy via \u003ccode\u003eAshPhoenix.Helpers.get_subdomain/2\u003c/code\u003e (for example through \u003ccode\u003eAshPhoenix.LiveView.SubdomainHook\u003c/code\u003e) to select the tenant from the request host.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The application uses subdomain-based multitenancy via `AshPhoenix.Helpers.get_subdomain/2` (for example through `AshPhoenix.LiveView.SubdomainHook`) to select the tenant from the request host.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.3.25\", \"versionStartIncluding\": \"2.1.26\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-31T03:05:38.612Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-82726\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-31T14:47:35.274Z\", \"dateReserved\": \"2026-08-31T00:59:08.960Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-31T03:05:38.612Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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