---
title: "CVE-2026-50564: Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape"
url: https://erroneo.us/security/cve/CVE-2026-50564/
description: "CVE-2026-50564 (github.com/fission/fission (Go)): Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-10
date_modified: 2026-06-30
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-50564"
kev: false
cvss: 9.9
epss: 0.00506
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-50564: Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 42: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 42% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes github.com/fission/fission (Go) <= 1.23.0, fixed in 1.24.0 . Check your lockfile, including transitive dependencies.

## What it is

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, Fission's Environment CRD exposes spec.runtime.podSpec and spec.builder.podSpec, which are merged into the Kubernetes pod specs for runtime and builder pods. The merge logic propagated hostNetwork, hostPID, hostIPC, container privileged, and serviceAccountName from the user-supplied podspec with no filtering, and Environment.Validate performed no security-relevant checks on these fields. This issue has been patched in version 1.24.0.

## Affected packages

- Go `github.com/fission/fission` <= 1.23.0 → fixed: 1.24.0

## Affected products (CVE record)

- fission fission: < 1.24.0

## Severity

- GitHub_M CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.51% probability of exploitation activity in the next 30 days; percentile 42.

## Sources

- [GitHub Advisory GHSA-gx55-f84r-v3r7](https://github.com/advisories/GHSA-gx55-f84r-v3r7)
- [CVE.org record CVE-2026-50564](https://www.cve.org/CVERecord?id=CVE-2026-50564)
- [NVD entry CVE-2026-50564](https://nvd.nist.gov/vuln/detail/CVE-2026-50564)
- [github.com](https://github.com/fission/fission/security/advisories/GHSA-gx55-f84r-v3r7)
- [github.com](https://github.com/fission/fission/pull/3391)
- [github.com](https://github.com/fission/fission/releases/tag/v1.24.0)
- [github.com](https://github.com/fission/fission/commit/e484df8460bb4e8026e24210120602aa7f181f64)

---
Source page: https://erroneo.us/security/cve/CVE-2026-50564/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt