eidetic-labs stigmem up to 0.9.0a11 Tombstone Mechanism _get_tombstone_filter tenant_id authorization

Summaryinfo

A vulnerability identified as critical has been detected in eidetic-labs stigmem up to 0.9.0a11. This vulnerability affects the function _get_tombstone_filter of the component Tombstone Mechanism. The manipulation of the argument tenant_id leads to authorization. This vulnerability is listed as CVE-2026-76236. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in eidetic-labs stigmem up to 0.9.0a11 and classified as critical. This issue affects the function _get_tombstone_filter of the component Tombstone Mechanism. The manipulation of the argument tenant_id with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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. issue_tombstone defaulted the tenant to "default" instead of the caller's tenant, allowing deletion records to be written to the wrong tenant, and the read-suppression path (_get_tombstone_filter and the tombstone scope cache) lacked a tenant_id predicate, so tombstone suppression was applied tenant-blind across fact queries and provenance reads. As a result, a tenant's deletion could be attributed to the wrong tenant and tombstone suppression could either hide facts belonging to other tenants or fail to hide facts within the correct tenant, undermining data isolation and RTBF guarantees. The issue is exploitable only on multi-tenant deployments running the opt-in stigmem-plugin-multi-tenant; single-tenant deployments are unaffected. Fixed in 0.9.0a12.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-76236 since 08/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.9.0a12 eliminates this vulnerability.

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Productinfo

Vendor

• eidetic-labs

Name

• stigmem

Version

• 0.9.0a11

Website

• Product: https://github.com/eidetic-labs/stigmem/

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