CVE-2026-73334Network attack vector

KMS token disclosure via file-controlled URL

Published Sep 9, 2026 · Updated Sep 10, 2026

Improper input validation in Apache Parquet Hadoop 1.12 through 1.18.0 allows attackers to disclose KMS tokens via crafted Parquet files. The org.apache.parquet.crypto.keytools reader forwards a file-supplied KMS URL to a pluggable KmsClient without enforcing destination-host validation. Exposure requires an encrypted-file reader that lacks an application-controlled URL and a custom client that accepts the supplied host; the token is then sent to an attacker-controlled server.

CVSS severity6.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Apache Parquet Hadoop 1.12 through 1.18.0 allows attackers to disclose KMS tokens via crafted Parquet files. The org.apache.parquet.crypto.keytools reader forwards a file-supplied KMS URL to a pluggable KmsClient without enforcing destination-host validation. Exposure requires an encrypted-file reader that lacks an application-controlled URL and a custom client that accepts the supplied host; the token is then sent to an attacker-controlled server.

The record

CVE
CVE-2026-73334
Published
Sep 9, 2026
Updated
Sep 10, 2026
Vendor
The Apache Software Foundation
Product
Apache Parquet Hadoop
Classifications
CWE-20, T1212
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.12 <=1.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Apache Software Foundation · Apache Parquet Hadoopversion=1.12 <=1.18.0

Published CVSS scores

6.5Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1212Exploitation for Credential Access

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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