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CVE-2026-52831— Nuclio: Unsanitized cron trigger event headers/body injected into CronJob shell command leads to persistent RCE

Quick assessment

Affected
nuclio nuclio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nuclio 是一个用于实时事件和数据处理的“无服务器”（Serverless）框架。在 1.16.4 版本之前，Nuclio 控制器会为每个 cron 触发器构建一个 curl 调用字符串，并将其存储为 Kubernetes CronJob 容器参数（/bin/sh, -c, <命令>）。触发器规范中的两个字段——event.headers 的键和 event.body——在未进行充分清理的情况下被嵌入该字符串中。该问题已在 1.16.4 版本中修复。

CVSS 8.0 · High
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I. Basic Information for CVE-2026-52831

Vulnerability Information
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Vulnerability Title
Nuclio: Unsanitized cron trigger event headers/body injected into CronJob shell command leads to persistent RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Nuclio is a "Serverless" framework for Real-Time Events and Data Processing. Prior to version 1.16.4, the Nuclio controller builds a curl invocation string for each cron trigger and stores it as the args of a Kubernetes CronJob container (/bin/sh, -c, <command>). Two fields in the trigger specification flow into this string without adequate sanitization: event.headers keys and event.body. This issue has been patched in version 1.16.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nuclio nuclio < 1.16.4 -

II. Public POCs for CVE-2026-52831

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III. Intelligence Information for CVE-2026-52831

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Other References for CVE-2026-52831 (3)

Same Patch Batch · nuclio · 2026-09-02 · 7 CVEs total

CVE-2026-79756 8.7 HIGH Nuclio: Unauthenticated OS command injection via namespace header in list-all resource pat
CVE-2026-45730 8.3 HIGH Nuclio: Missing authorization on project write paths allows any authenticated user to modi
CVE-2026-52833 8.0 HIGH Nuclio: Unsanitized runtimeAttributes.repositories injected into Groovy build.gradle leads
CVE-2026-79755 8.0 HIGH Nuclio: Unauthenticated OS command injection via function namespace in docker ps --filter
CVE-2026-79754 7.1 HIGH Nuclio: Kaniko build tempDir command injection
CVE-2026-52832 4.9 MEDIUM Nuclio: Unauthenticated path traversal in spec.handler allows arbitrary file write in Dash

IV. Related Vulnerabilities

Same product: nuclio
Same vendor: nuclio
Same weakness: CWE-78

V. Comments for CVE-2026-52831

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