---
id: CVE-2026-76236
title: >-
  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
summary: >-
  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,…
severity: high
cwe:
  - CWE-639
vendor: stigmem-node
product: stigmem-node
affected:
  - stigmem-node < 0.9.0a12
patched:
  - stigmem-node 0.9.0a12
published: '2026-08-19'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T18:28:15.520'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76236'
references:
  - url: >-
      https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-x26h-xmv8-gxf7
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/stigmem-before-0a12-cross-tenant-bola-via-tombstones
    label: disclosure@vulncheck.com
  - url: 'https://github.com/eidetic-labs/stigmem/pull/728'
  - url: 'https://github.com/eidetic-labs/stigmem'
tags:
  - nvd
  - osv
  - pip
epss: 0.00265
epssPercentile: 0.18711
aliases:
  - GHSA-x26h-xmv8-gxf7
ecosystem: pip
ingestedAt: '2026-08-20T19:23:06.942Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-76236)

Affected packages:

- `stigmem-node < 0.9.0a12`

Patched in:

- `stigmem-node 0.9.0a12`

Source: https://osv.dev/vulnerability/GHSA-x26h-xmv8-gxf7