{"id":"CVE-2026-50567","aliases":["GHSA-q6vm-xqc9-v3ff"],"url":"https://o3.security/vulnerability/CVE-2026-50567","summary":"Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory","details":"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.","published":"2026-06-10T17:30:45.695Z","modified":"2026-08-12T03:51:10.100198103Z","cvss":{"score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/fission/fission","fixedVersion":"1.25.0"}],"fix":{"url":"https://github.com/fission/fission/pull/3444","label":"fission/fission#3444"},"references":[{"type":"WEB","url":"https://github.com/fission/fission/releases/tag/v1.25.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50567.json"},{"type":"ADVISORY","url":"https://github.com/fission/fission/security/advisories/GHSA-q6vm-xqc9-v3ff"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50567"},{"type":"FIX","url":"https://github.com/fission/fission/pull/3444"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:10.100198103Z"}}