CVE-2025-33042 Apache Avro Java SDK: Code injection on Java generated code
Attackers can execute arbitrary code by providing malicious Avro schemas to the Apache Avro Java SDK during record generation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-33042?
CVE-2025-33042 is a high-severity code injection vulnerability in Apache Avro Java SDK, published on 13 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Control of Generation of Code ('Code Injection') vulnerability in Apache Avro Java SDK when generating specific records from untrusted Avro schemas.
This issue affects Apache Avro Java SDK: all versions through 1.11.4 and version 1.12.0.
Users are recommended to upgrade to version 1.12.1 or 1.11.5, which fix the issue.
Weakness: CWE-94
Which versions are affected by CVE-2025-33042?
5 open source packages ship an affected version, including org.apache.avro:avro-compiler and avro. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.avro:avro-compiler Maven | All versions | 1.11.5 |
org.apache.avro:avro-compiler Maven | All versions | 1.11.5 |
org.apache.avro:avro-compiler Maven | From 1.12.0 | 1.12.1 |
org.apache.avro:avro-compiler Maven | From 1.12.0 | 1.12.1 |
avro PyPI | All versions | 1.11.5 |
Products include Apache Avro.
How do I fix CVE-2025-33042?
Upgrade org.apache.avro:avro-compiler to a fixed version for your release line: 1.11.5 or 1.12.1.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-33042 being exploited?
There is no known exploitation of CVE-2025-33042 in the wild and no public exploit code.
Other vulnerabilities in Apache Avro Java SDK
- CVE-2024-47561 Apache Avro Java SDK: Arbitrary Code Execution when reading Avro schema (Java SDK)
- CVE-2023-39410 Apache Avro Java SDK: Memory when deserializing untrusted data in Avro Java SDK
- CVE-2022-35724 Denial of service while reading data in Avro Rust SDK
- CVE-2022-36124 Memory overconsumption in Avro Rust SDK
- CVE-2022-36125 Integer overflow when reading corrupted .avro file in Avro Rust SDK
Sources
Also known as CLEANSTART-2026-YI17709, CLSA-2026-1786540164, CLSA-2026-1786540569, CLSA-2026-1786540745, CLSA-2026-1792063230, CLSA-2026-1792063313 and 15 more.