CVE-2026-50567: Fission Zip Slip Vulnerability
HIGHCVE-2026-50567 is a HIGH (CVSS 7.7) zip slip vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Fission libraries in the Go ecosystem. The issue involves zip slip in pkg/utils/zip.go:unarchive allows fetcher to write outside the destination directory. Remediation is available by upgrading affected packages to version 1.25.0.
CVE-2026-50567 at a Glance
Security Impact
CVSS: 7.7
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N).
How to Fix CVE-2026-50567
To remediate this vulnerability, upgrade all affected Fission dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/fission/fission to 1.25.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/fission/fissionHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-50567, inspect your project dependencies for Fission:
inspect dependencies for github.com/fission/fissionAnalyze the terminal output to locate any version of Fission in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.25.0), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Fission, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-50567 Affected Fission Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/fission/fission
|
Go |
< 1.25.0
|
1.25.0
|
References
Frequently Asked Questions
What is CVE-2026-50567?
Which Fission versions are affected?
What version fixes CVE-2026-50567?
Is github.com/fission/fission affected?
What is the CVSS score of CVE-2026-50567?
What CWE is associated with CVE-2026-50567?
How can I check Go dependencies for CVE-2026-50567?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-q6vm-xqc9-v3ff",
"modified" : "2026-07-28T20:16:52Z",
"published" : "2026-07-28T20:16:52Z",
"aliases" : [ "CVE-2026-50567" ],
"summary" : " Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory",
"details" : "`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\n `../../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\n files anywhere that process could reach: into other tenants' `/packages/<ns>/` directories, into mounted secret/config volumes, or into the fetcher's own binary.\n\n ### Affected\n\n - Project: `github.com/fission/fission`\n - Versions: all up to and including v1.24.0\n - Audited commit: `647c141`\n - Component: `pkg/utils/zip.go` (`Unarchive`)\n - Configuration: default; triggered when the fetcher downloads and extracts a zip archive\n\n Fix section (paste into the Fix / Patches field)\n\n Fixed in [v1.25.0](https://github.com/fission/fission/releases/tag/v1.25.0) by:\n\n - [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\n 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.\n\n Regression coverage: `TestUnarchiveZipSlip` in `pkg/utils/zip_test.go` exercises parent-traversal, absolute-path, and symlink entries.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/fission/fission"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.25.0"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 1.24.0"
}
} ],
"references" : [ {
"type" : "WEB",
"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" : "WEB",
"url" : "https://github.com/fission/fission/pull/3444"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/fission/fission"
}, {
"type" : "WEB",
"url" : "https://github.com/fission/fission/releases/tag/v1.25.0"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-28T20:16:52Z",
"nvd_published_at" : "2026-06-10T18:17:13Z"
}
}