CVE-2026-73334 Apache Parquet - Information Disclosure

Apache Parquet 1.12 to 1.18 contains a potential information disclosure caused by lack of host validation in pluggable KmsClient implementations when using file-controlled KMS URLs, letting attackers receive KMS tokens, exploit requires use of file-controlled KMS URL without application control.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Published
9 September 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Upgrade to version 1.19 or later and leverage application control for KMS URL parameter in readers.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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