{
  "from_raw": "Jean-Baptiste Onofr\u00e9 <jbonofre@apache.org>",
  "from": "Jean-Baptiste Onofr\u00e9 <jb...@apache.org>",
  "gravatar": "27790393b874159fe05609ca7ed812f9",
  "to": "an...@apache.org,\n de...@polaris.apache.org",
  "subject": "CVE-2026-42811: Apache Polaris: In plain terms, Polaris is supposed to issue short-lived GCS credentials that only work for one table's files, but a crafted namespace or table name can cause those credentials to work across the configured bucket instead.",
  "message-id": "<7b138b57-9aac-ea72-c34c-582c510c07e4@apache.org>",
  "mid": "2ozbhl3gvhog5sntfhfndb4pohno0dbf",
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    "2ozbhl3gvhog5sntfhfndb4pohno0dbf",
    "3466960e75475bcb4ea0c48d32428d74b8fa9f5b32c68378766dfeac@<announce.apache.org>"
  ],
  "dbid": "5dff7559568ff2a18e0495dace868adaee6e3d8fe2dc954a7da177203bcede77",
  "cc": "de...@polaris.apache.org",
  "epoch": 1777737673,
  "list": "<announce.apache.org>",
  "list_raw": "<announce.apache.org>",
  "date": "2026/05/02 16:01:13",
  "private": false,
  "references": "",
  "in-reply-to": "",
  "body": "Severity: important \n\nAffected versions:\n\n- Apache Polaris before 1.4.1\n\nDescription:\n\nIn plain terms, Apache Polaris is supposed to issue short-lived GCS credentials\nthat\nonly work for one table's files, but a crafted namespace or table name can\ncause those credentials to work across the configured bucket instead.\n\n\nApache Polaris builds Google Cloud Storage downscoped credentials by creating a\nCredential Access Boundary (CAB) with CEL conditions that are intended to\nrestrict access to the requested table's storage path.\n\n\n\nThe relevant CEL string is built from the bucket name and the table path.\nThat\ntable path is derived from namespace and table identifiers. In current code,\nthat path appears to be inserted into the CEL expression without escaping.\n\n\n\nAs a result, a namespace or table identifier containing a single quote and\nother URI-safe CEL fragments can break out of the intended quoted string and\nchange the meaning of the CEL condition.\n\n\n\nIn private testing against Polaris 1.4.0 on real Google Cloud Storage, I\nconfirmed that Polaris accepted a crafted identifier and returned delegated\nGCS\ncredentials whose CEL path restriction had effectively collapsed.\n\n\nThose delegated credentials could then:\n\n\n- list another table's object prefix;\n\n- read another table's metadata control file (Iceberg metadata JSON);\n\n- create and delete an object under another table's object prefix;\n\n- and also list, read, create, and delete objects under an unrelated\nexternal\nprefix in the same bucket that was not part of any table path.\n\n\n\nThat last point is important. The issue is not limited to \"another table\".\nIn\nthe confirmed setup, once Apache Polaris returned credentials for the crafted\ntable,\nthe path restriction inside the configured bucket was effectively gone.\n\nThe practical effect is that temporary credentials for one crafted table\ncan be\nbroader than the table Polaris was asked to authorize, and can become\neffectively bucket-wide within the configured bucket.\n\n\n\nThe current GCS repro uses a Polaris principal with broad catalog privileges\nfor setup. I have not yet repeated the separate least-privilege Polaris-RBAC\nvariant on GCS. However, the storage-credential broadening itself is\nconfirmed\non real GCS.\n\nReferences:\n\nhttps://polaris.apache.org\nhttps://www.cve.org/CVERecord?id=CVE-2026-42811\n\n",
  "body_short": "Severity: important \n\nAffected versions:\n\n- Apache Polaris before 1.4.1\n\nDescription:\n\nIn plain terms, Apache Polaris is supposed to issue short-lived GCS credentials\nthat\nonly work for one table's fil",
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}