CVE-2026-35194: Apache Flink: Remote code execution via SQL injection in code generation

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-15 · updated 2026-10-26
Weakness: CWE-94

Description

Code injection in SQL code generation in Apache Flink 1.15.0 through 1.20.x and 2.0.0 through 2.x allows authenticated users with query submission privileges to execute arbitrary code on TaskManagers via maliciously crafted SQL queries. The vulnerability affects JSON functions (1.15.0+) and LIKE expressions with ESCAPE clauses (1.17.0+). User-controlled strings are interpolated into generated Java code without proper escaping, allowing attackers to break out of string literals and inject arbitrary expressions. Users are recommended to upgrade to either version 1.20.4, 2.0.2, 2.1.2 or 2.2.1, which fixes this issue.

Affected products

Apache Software Foundation Apache Flink: from 1.15.0 before 1.20.4; from 2.0.0 before 2.0.2; from 2.1.0 before 2.1.2; 2.2.0, 2.2.0-rc1, 2.2.0-rc2 — fixed in 1.20.4, 2.0.2, 2.1.2

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Flink 1.20.4, 2.0.2, 2.1.2. Check the vendor advisory for mitigations.

References

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