{"id":"GHSA-6gqw-jqv7-v88m","summary":"stigmem-node: decay sweep expires and counts facts across all tenants (cross-tenant BOLA)","details":"### Summary\nOn a multi-tenant stigmem node, a caller holding a `write` credential for **one** tenant can run a decay sweep that acts on **every** tenant's facts. The candidate-selection queries in `lifecycle/decay.py` (`_select_ttl_candidates`, `_select_confidence_candidates`) carried no `tenant_id` predicate, and the caller's tenant was not threaded into the sweep or its async worker (`run_decay_sweep` / `_decay_job_worker`), reached via `POST /v1/decay/sweep`.\n\n### Impact\nA sweep with `ttl_seconds=0` expires **all tenants'** facts — cross-tenant data destruction (integrity and availability). A `dry_run` sweep returns a global candidate count, acting as a cross-tenant existence/volume **oracle** (information disclosure).\n\n### Affected configurations\nThis is a cross-**tenant** break. It is exploitable **only** on deployments running the opt-in `stigmem-plugin-multi-tenant` (multiple tenants on one node). A default single-tenant node has only `tenant=\"default\"` — there is no second tenant to cross — so it is **not exploitable** on default deployments. The rating is HIGH for the multi-tenant deployments the plugin exists to isolate.\n\n### Patches\nFixed in `0.9.0a12` (PR #728): `identity.tenant_id` is threaded into `run_decay_sweep` and `_decay_job_worker`, and `AND tenant_id = ?` was added to the candidate selectors and the graph-sync. A tenant-B sweep now leaves tenant-A facts untouched, and `dry_run` counts only the caller's tenant. The `check_fact_query_tenant_scope.py` CI guard was extended to scan `lifecycle/` so this class cannot silently regress.\n\n### Workarounds\nNone other than upgrading to `0.9.0a12`. Single-tenant deployments are unaffected.","aliases":["CVE-2026-76238"],"modified":"2026-08-20T04:04:15.541792931Z","published":"2026-06-19T21:43:02Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-06-19T21:43:02Z","nvd_published_at":null,"cwe_ids":["CWE-863"]},"references":[{"type":"WEB","url":"https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-6gqw-jqv7-v88m"},{"type":"WEB","url":"https://github.com/eidetic-labs/stigmem/pull/728"},{"type":"PACKAGE","url":"https://github.com/eidetic-labs/stigmem"}],"affected":[{"package":{"name":"stigmem-node","ecosystem":"PyPI","purl":"pkg:pypi/stigmem-node"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.0a12"}]}],"versions":["0.9.0a1","0.9.0a10","0.9.0a11","0.9.0a2","0.9.0a3","0.9.0a4","0.9.0a5","0.9.0a6","0.9.0a7","0.9.0a8","0.9.0a9"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6gqw-jqv7-v88m/GHSA-6gqw-jqv7-v88m.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N"}]}