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                            CERT-Renater

                Note d'Information No. 2026/VULN512
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DATE                : 18/05/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache Flink versions prior to 
                              1.20.4, 2.0.2, 2.1.2, 2.2.1.

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https://lists.apache.org/thread/s63vo6lvvxgdq59khlcz596gcvxlyx30
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CVE-2026-35194: Apache Flink: Remote code execution via SQL injection
in code generation

Severity: critical 

Affected versions:

- Apache Flink 1.15.0 before 1.20.4,2.0.2,2.1.2,2.2.1

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.

Credit:

Yaswant Katakam, Confluent InfoSec (finder)

References:

https://flink.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-35194



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