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Medium, CVSS 4.9amended

Capsule: Malformed ForbiddenAnnotations.Regex can bypass Tenant validation and trigger namespace admission panic

CVE-2026-61794GHSA-gxjc-74v5-3vx3

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/projectcapsule/capsule 0.13.7), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.9 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-61794: 0.59% estimated exploitation activity in the next 30 days; percentile 48.13 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary A validation bug in internal/webhook/tenant/validation/forbiddenannotationsregex.go allows an invalid ForbiddenAnnotations.Regex value to bypass Tenant admission on update. The webhook compiles ForbiddenLabels.Regex for both labels and annotations, so a malformed annotations regex can be persisted. Once stored, namespace admission later evaluates the bad regex through pkg/api/forbiddenlist.go, where regexp.MustCompile can panic and cause admission failure. Details In internal/webhook/tenant/validation/forbiddenannotationsregex.go, OnUpdate validates the new Tenant object, but the loop compiles tnt.Spec.NamespaceOptions.ForbiddenLabels.Regex for both labels and annotations. That means an invalid ForbiddenAnnotations.Regex is never validated if ForbiddenLabels.Regex is valid. Relevant paths: - internal/webhook/tenant/validation/forbiddenannotationsregex.go - internal/webhook/namespace/validation/usermetadata.go - pkg/api/forbiddenlist.go Namespace admission later calls…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-gxjc-74v5-3vx3

  2. Revision 2 · amended ·

    Amended from osv record GO-2026-6521

  3. Revision 1 · created ·

    Published from osv record GHSA-gxjc-74v5-3vx3

Agent brief

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# Patch Next advisory brief: CVE-2026-61794

Advisory: Capsule: Malformed ForbiddenAnnotations.Regex can bypass Tenant validation and trigger namespace admission panic
IDs: CVE-2026-61794, GHSA-gxjc-74v5-3vx3
Record: https://patchnext.com/advisories/cve-2026-61794 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/projectcapsule/capsule 0.13.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/projectcapsule/capsule: affected >= 0.13.0, < 0.13.7; fixed in 0.13.7

## Suggested inspection (read-only)
- Go github.com/projectcapsule/capsule: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/projectcapsule/capsule.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-gxjc-74v5-3vx3 (OSV record GHSA-gxjc-74v5-3vx3 lists affected ranges: Go github.com/projectcapsule/capsule >=0.13.0 <0.13.7 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6521 (OSV record GO-2026-6521 lists affected ranges: Go github.com/projectcapsule/capsule >=0.13.0 <0.13.7 (fixed))
- Verified: https://github.com/advisories/GHSA-gxjc-74v5-3vx3 (GitHub-reviewed advisory GHSA-gxjc-74v5-3vx3 lists affected ranges: Go github.com/projectcapsule/capsule >=0.13.0 <0.13.7)

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