CVE-2026-52833 Nuclio: Unsanitized runtimeAttributes.repositories injected into Groovy build.gradle leads to build-time RCE
Attackers can inject arbitrary Groovy code into build files via unsanitized repository attributes, leading to remote code execution during function builds.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-52833?
CVE-2026-52833 is a high-severity code injection vulnerability in nuclio, published on 2 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Nuclio is a "Serverless" framework for Real-Time Events and Data Processing. Prior to version 1.16.5, Nuclio's Java runtime generates a build.gradle file during function builds using Go's text/template package. The template renders runtimeAttributes.repositories[] values with the {{ . }} action, which performs no escaping. An attacker can embed a closing brace (}) to break out of the repositories {} block and append arbitrary Groovy statements that execute unconditionally during the Gradle configuration phase. This issue has been patched in version 1.16.5.
Weakness: CWE-94
Which versions are affected by CVE-2026-52833?
3 open source packages ship an affected version, including github.com/nuclio/nuclio.
| Package | Affected | Fixed in |
|---|---|---|
github.com/nuclio/nuclio Go | All versions | None |
github.com/nuclio/nuclio Go | All versions | 1.16.5 |
github.com/nuclio/nuclio Go | All versions | 1.16.5 |
How do I fix CVE-2026-52833?
Upgrade github.com/nuclio/nuclio to 1.16.5 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-52833 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52833 exists.
Sources
Also known as GHSA-3v79-m2cg-89ww, GO-2026-6004.