Apache Arrow C++, PyArrow: Parquet file-controlled KMS URL is forwarded to pluggable KmsClient that skips host validation
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Published
3 h ago
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Vulnerability description
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DayBreach AI Explanation
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Evidence confidence
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Short explanation
In Apache Arrow C++ (4.0.0‑25.0.1) and PyArrow (8.0.0‑25.0.1), KMS URLs defined in Parquet files are forwarded to KmsClient without validation, allowing a malicious host to receive a KMS token.
Leakage of KMS tokens to an unauthorized server endangers data confidentiality.
What should be done?
- Upgrade Apache Arrow C++ and PyArrow to version 26.0.0
- In 26.0.0+ the behavior is disabled by default; enable it only with the read_kms_url flag
- For older versions, explicitly set the KMS URL in KmsConnectionConfig
- Ensure KmsClient implementations validate received URLs
Chain of evidence and sources
Apache Arrow C++ 4.0.0‑25.0.1 ve PyArrow 8.0.0‑25.0.1 sürümleri bu sorunu içerir.
26.0.0 sürümüne yükseltmek, dosya kontrolündeki KMS URL yönlendirmesini varsayılan olarak devre dışı bırakır ve yalnızca read_kms_url bayrağıyla etkinleştirilebilir.
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Show the technical text from the sources
Pass-through of unvalidated KMS URLs to KMS clients in Apache C++ Parquet and PyArrow versions 4.0.0 to 25.0.1. This affects users who read Parquet files and configure Parquet decryption properties with a KmsClient implementation. On the reader side, the KMS URL can be application-controlled (specified in the KmsConnectionConfig) or file-controlled. If the user does not leverage application control for this parameter, a file-controlled KMS URL is forwarded to a pluggable KmsClient implementation. If the KMS implementation does not perform host validation and makes use of the provided KMS URL, a KMS token can be sent to a malicious host set by an attacker in the file. Users are recommended to upgrade to version 26.0.0, which disables this behavior by default and requires that users opt-in to it by enabling the read_kms_url flag in the DecryptionConfiguration. Users of affected versions are recommended to either specify the KMS URL in the KmsConnectionConfig when reading files, or ensure any KmsClient implementations validate received KMS URLs. Users that opt-in to file-controlled KMS URLs in version 26.0.0 and later must ensure KmsClients validate KMS URLs.
CWE: CWE-20
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
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SCORING: CVSS from Multiple Sources
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Public exploit and active exploitation status
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Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-92287 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-92287 weaknesses.
Official Sources and Advisories
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Weakness Type (CWE & CAPEC)
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