Apache Parquet is widely used across data platforms; this flaw can leak KMS tokens and enable decryption of encrypted enterprise data, potentially impacting many organizations.
CVE-2026-73334
Parquet file can specify KMS URL, leaking KMS tokens to attacker hosts.
Is CVE-2026-73334 being exploited?
Not confirmed. CVE-2026-73334 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2026-73334?
CVE-2026-73334 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-73334?
Yes. A fix has been recorded for CVE-2026-73334. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73334 affect?
CVE-2026-73334 affects Apache Parquet 1.12 - 1.18, Data platforms using Parquet encryption (Spark, Hive, Presto, Hadoop). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73334?
Enforce application-controlled KMS URL; validate KMS hosts/auth; upgrade to 1.19+ when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
File-controlled KMS URL can exfiltrate KMS tokens to attacker-controlled hosts, enabling decryption of Parquet data and unauthorized key access.
Immediate action required
- affected>= 1.12 and <= 1.18.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.