GHSA-3r8v-2xmj-5c39

Source

https://github.com/advisories/GHSA-3r8v-2xmj-5c39

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-3r8v-2xmj-5c39/GHSA-3r8v-2xmj-5c39.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-3r8v-2xmj-5c39

Aliases

CVE-2026-49823

Published

2026-06-30T18:16:33Z

Modified

2026-06-30T18:30:08.033316241Z

Severity

7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator

Summary

Fission: Cross-namespace Package read via unvalidated PackageRef in Function admission webhook

Details

Summary

A Fission Function spec carries three reference types — Secret, ConfigMap, and Package. The first two were namespace-validated by the admission webhook; PackageRef.Namespace was not.

Details

A tenant with functions.fission.io/create in their own namespace could set spec.package.packageref.namespace to any other namespace. When the function is invoked, the fetcher sidecar reads the victim Package using the fission-fetcher service account's namespace-wide get packages permission and writes its contents to /userfunc/deployarchive inside the attacker's pool pod, exposing the victim's source code and any embedded credentials.

The fission-fetcher SA holds get packages in every configured function namespace (granted by charts/fission-all/templates/_function-access-role.tpl), so the namespace check was the only barrier between the attacker and any in-cluster Fission Package.

Impact

A function author in one namespace could read the deployment archive — and therefore the source code and embedded secrets — of any Package in any other namespace.

Fix

Fixed in #3389 and released in v1.24.0.

The admission webhook (pkg/webhook/function.go::Validate) rejects Function.spec.package.packageref.namespace != metadata.namespace. An empty namespace remains accepted (controllers default it to the function's namespace). This shipped together with the EnvironmentRef cross-namespace check (GHSA-cvw6-gfvv-953q).

Behavioural change

Functions that explicitly set spec.package.packageref.namespace to a different namespace are now rejected at admission.

Database specific

{
    "nvd_published_at": "2026-06-10T18:17:10Z",
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-284",
        "CWE-863"
    ],
    "github_reviewed_at": "2026-06-30T18:16:33Z",
    "github_reviewed": true
}

References

Affected packages

Go / github.com/fission/fission

Package

Name: github.com/fission/fission; View open source insights on deps.dev
Purl: pkg:golang/github.com/fission/fission

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.24.0

Database specific

last_known_affected_version_range

"<= 1.23.0"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-3r8v-2xmj-5c39/GHSA-3r8v-2xmj-5c39.json"