Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory
CVSS score
7.7
EPSS probability
%0.4
Risk score
0.0
Published
2 mo ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-50567 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
`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. ### Affected - Project: `github.com/fission/fission` - Versions: all up to and including v1.24.0 - Audited commit: `647c141` - Component: `pkg/utils/zip.go` (`Unarchive`) - Configuration: default; triggered when the fetcher downloads and extracts a zip archive Fix section (paste into the Fix / Patches field) Fixed in [v1.25.0](https://github.com/fission/fission/releases/tag/v1.25.0) by: - [PR #3444](https://github.com/fission/fission/pull/3444) (commit [`55704aca`](https://github.com/fission/fission/commit/55704aca1b8d6f45bc7c7c2e4805c7e14875ec0f)) — `Unarchive` now opens an `os.Root` on the destination, validates each archive entry name (rejects absolute paths and `..` traversal), and refuses symlink entries up front. The `os.Root` confines every `mkdir` / `create` to the destination in the kernel. Regression coverage: `TestUnarchiveZipSlip` in `pkg/utils/zip_test.go` exercises parent-traversal, absolute-path, and symlink entries.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 7.7 | CVSS 3.x | — | Vector not published | GitHub Advisory |
| 0.0 | CVSS 4.0 | — | Vector not published | GitHub Advisory |
Patch and Remediation Guide
Solution & Remediation Advisory
1 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.
1.25.0OSV düzeltilmiş sürüm: 1.25.0
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-50567 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-50567 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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