# CVE-2026-50567: Fission path traversal in zip extraction utility

Source: https://junglewise.ai/threats/cve-2026-50567-fission-path-traversal-in-zip-extraction-utility  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-10. Updated: 2026-07-28  
License: CC BY 4.0 with a link back

CVE-2026-50567 · Severity: high · CVSS 7.7 · Published 2026-06-10

Fission is a serverless framework for Kubernetes. A vulnerability in its archive extraction utility allows an attacker to write malicious files outside of the intended directory by providing a specially crafted ZIP file. This could lead to the overwriting of sensitive system files, configuration secrets, or the application's own binary, potentially compromising the entire environment or other users' data.

Technologies: [Fission](https://junglewise.ai/threats/technologies/fission), [github.com/fission/fission (Go)](https://junglewise.ai/threats/technologies/github-com-fission-fission). Vendors: [Fission](https://junglewise.ai/threats/vendors/fission), [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-50567 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-50567 being exploited in the wild.

**How severe is CVE-2026-50567?** High severity, with a CVSS score of 7.7, published 10 June 2026.

**Which products and versions are affected?** Fission <= 1.24.0; github.com/fission/fission (Go) <= 1.24.0, SEMVER:introduced=0,fixed=1.25.0.

**Is there a fix for CVE-2026-50567?** Yes. github.com/fission/fission (Go): upgrade to 1.25.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-50567 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-50567?** Check whether you run Fission or github.com/fission/fission (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/fission/fission (Go): upgrade to 1.25.0 or later

  ```sh
  go get github.com/fission/fission@v1.25.0
  ```


## Technical details

A path traversal vulnerability, commonly known as 'Zip Slip', exists in the `Unarchive` function within `pkg/utils/zip.go`. The component uses `filepath.Join` to combine archive entry names with the destination directory without verifying if the resulting path remains within the target boundaries. An attacker who can control a `Package.Spec.Source.URL` or `Deployment.URL` can provide a ZIP archive containing entries with `../` sequences. This allows the `fission-fetcher` sidecar to write files to arbitrary locations accessible to the process, including mounted secret volumes or other tenant directories. The issue is fixed in version 1.25.0 by implementing `os.Root` for directory confinement and validating entry names against traversal sequences and symlinks.

## Affected products

- fission fission <= 1.24.0

## Identifiers

- CVE-2026-50567
- GHSA-q6vm-xqc9-v3ff
- GO-2026-6127

## Timeline

- 2026-06-08: disclosed
- 2026-06-10: advisory: NVD publication
- 2026-07-28: patched: GitHub Advisory updated/published

## References

- [https://api.github.com/users/0xshdax](https://api.github.com/users/0xshdax)
- [https://github.com/0xshdax](https://github.com/0xshdax)
- [https://api.github.com/users/0xshdax/gists%7B/gist_id%7D](https://api.github.com/users/0xshdax/gists%7B/gist_id%7D)
- [https://api.github.com/users/0xshdax/repos](https://api.github.com/users/0xshdax/repos)
- [https://avatars.githubusercontent.com/u/29938825?v=4](https://avatars.githubusercontent.com/u/29938825?v=4)
- [https://api.github.com/users/0xshdax/events%7B/privacy%7D](https://api.github.com/users/0xshdax/events%7B/privacy%7D)

## Related threats

- [GO-2026-5849 - Fission: MessageQueueTrigger scaler manager materializes Secret values into Deployment envvars and accepts arbitrary user PodSpec in github.](https://junglewise.ai/threats/go-2026-5849-fission-messagequeuetrigger-scaler-manager-materializes-509f5f41)
- [Fission privilege escalation in MessageQueueTrigger scaler manager](https://junglewise.ai/threats/fission-privilege-escalation-in-messagequeuetrigger-scaler-manager-7fe266a4)
- [Fission incomplete capability denylist in Environment and Function CRDs](https://junglewise.ai/threats/cve-2026-50570-fission-incomplete-capability-denylist-in-environment-and)
- [Fission HTTPTrigger improper input validation in RelativeURL and Prefix](https://junglewise.ai/threats/cve-2026-50569-fission-httptrigger-improper-input-validation-in-relativeurl-and)
- [Fission path traversal in SanitizeFilePath utility](https://junglewise.ai/threats/cve-2026-50568-fission-path-traversal-in-sanitizefilepath-utility)