CVE-2026-76236 stigmem before 0.9.0a12 Cross-Tenant BOLA via Tombstones

stigmem-node before 0.9.0a12 contains a cross-tenant broken object level authorization BOLA flaw in the RTBF right-to-be-forgotten tombstone mechanism. issuetombstone defaulted the tenant to "default" instead of the caller's tenant, allowing deletion records to be written to the wrong tenant, and...