{"id":"CVE-2026-22728","aliases":["GHSA-465p-v42x-3fmj","BIT-sealed-secrets-2026-22728","GO-2026-4565"],"title":"Sealed Secrets for Kubernetes: Rotate API Allows Scope Widening from Strict/Namespace-Wide to Cluster-Wide via Untrusted Template Annotat…","summary":"Sealed Secrets for Kubernetes: Rotate API Allows Scope Widening from Strict/Namespace-Wide to Cluster-Wide via Untrusted Template Annotations","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","vendor":"bitnami-labs","product":"github.com/bitnami-labs/sealed-secrets","ecosystem":"go","affected":["github.com/bitnami-labs/sealed-secrets < 0.36.0"],"patched":["github.com/bitnami-labs/sealed-secrets 0.36.0"],"published":"2026-02-26","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:34.020538821Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-465p-v42x-3fmj","references":[{"url":"https://github.com/bitnami-labs/sealed-secrets/security/advisories/GHSA-465p-v42x-3fmj"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-22728"},{"url":"https://github.com/bitnami-labs/sealed-secrets/commit/d57ee4a8357d250e602b995399b525496ab688c1"},{"url":"https://github.com/bitnami-labs/sealed-secrets"},{"url":"https://github.com/bitnami-labs/sealed-secrets/releases/tag/v0.36.0"}],"tags":["osv","go"],"epss":0.00352,"epssPercentile":0.28896,"ingestedAt":"2026-09-12T03:13:01.751Z","slug":"CVE-2026-22728","body":"## Overview\n\nThis report shows a scope-widening issue in the rotate (re-encrypt) flow: the output scope can be derived from untrusted `spec.template.metadata.annotations` on the input sealed secret.\n\nIf a victim sealed secret is strict- or namespace-scoped, an attacker who can submit it to the rotate endpoint can set `sealedsecrets.bitnami.com/cluster-wide=true` in the template metadata and receive a rotated sealed secret that is cluster-wide, enabling retargeting (`metadata.name`/`metadata.namespace`) and unsealing to recover the victim plaintext.\n\n## Relevant Links (Pinned)\n\n- Rotate handler uses `NewSealedSecret(..., secret)` after unsealing: https://github.com/bitnami-labs/sealed-secrets/blob/946bc048f3407117c837da6e4300686522d4c4eb/pkg/controller/controller.go#L560-L606\n- Scope derivation reads secret annotations (`SecretScope`): https://github.com/bitnami-labs/sealed-secrets/blob/946bc048f3407117c837da6e4300686522d4c4eb/pkg/apis/sealedsecrets/v1alpha1/sealedsecret_expansion.go#L112-L122\n\n## Root Cause\n\nThe rotate flow unseals the input sealed secret to a `Secret`, then reseals using `NewSealedSecret(..., secret)`.\n\nBecause `SecretScope(secret)` is computed from secret annotations, and unsealing applies `spec.template` metadata onto the unsealed secret, an attacker can influence the scope of the rotated output by mutating template annotations on the rotate input.\n\n## Attack Path\n\n1. Attacker obtains a victim `SealedSecret` object (for example via read access to resources or logs) and can submit it to the controller rotate endpoint.\n2. Attacker sets `spec.template.metadata.annotations.sealedsecrets.bitnami.com/cluster-wide=true` (and optionally retargets name/namespace fields).\n3. Rotate returns a resealed, cluster-wide sealed secret that is no longer bound to the victim name/namespace.\n4. Attacker unseals the rotated output in their chosen namespace/name to recover the victim plaintext.\n\n## Proof of Concept\n\nSetup + run:\n\n```bash\nunzip poc.zip -d poc\ncd poc\nmake test\n```\n\nCanonical output (excerpt):\n\n```\n[CALLSITE_HIT]: pkg/apis/sealedsecrets/v1alpha1/sealedsecret_expansion.go:112 SecretScope\n[PROOF_MARKER]: scope_widened=true rotated_scope=cluster-wide\n```\n\nControl output (excerpt):\n\n```\n[NC_MARKER]: scope_widened=false strict_scope_preserved=true\n```\n\n## Fix Accepted When\n\nRotate preserves the original sealing scope and does not allow scope widening based on untrusted template metadata; strict or namespace-wide inputs cannot produce cluster-wide outputs.\n\n[poc.zip](https://github.com/user-attachments/files/25080027/poc.zip)\n[PR_DESCRIPTION.md](https://github.com/user-attachments/files/25080028/PR_DESCRIPTION.md)\n[attack_scenario.md](https://github.com/user-attachments/files/25080029/attack_scenario.md)\n\n## Affected packages\n\n- `github.com/bitnami-labs/sealed-secrets < 0.36.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/bitnami-labs/sealed-secrets 0.36.0`","depth":"sunlit","depthScore":27,"depthScoreParts":{"impact":27,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}