Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M
CVE-2026-50567Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory
High 7.7
In plain English
A high-severity path traversal in fission from fission. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, Unarchive in pkg/utils/zip.go joined each archive entry name with the destination directory via filepath.Join and wrote the result without checking whether the resolved path stayed under the destination. A zip entry named ../../tmp/evil therefore landed at /tmp/evil. An attacker who could control a Package.Spec.Source.URL or Deployment.URL archive could induce the fetcher (running as the per-environment pod's fission-fetcher sidecar) to write files anywhere that process could reach: into other tenants' /packages/<ns>/ directories, into mounted secret/config volumes, or into the fetcher's own binary. This issue has been patched in version 1.25.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/fission/fission | 1.25.0 | GHSA-q6vm-xqc9-v3ff |
| Go | github.com/fission/fission | 1.25.0 | GO-2026-6127 |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
References
- https://github.com/fission/fission/security/advisories/GHSA-q6vm-xqc9-v3ff x_refsource_CONFIRM
- https://github.com/fission/fission/pull/3444 x_refsource_MISC
- https://github.com/fission/fission/releases/tag/v1.25.0 x_refsource_MISC