CVE-2026-76236
stigmem before 0.9.0a12 Cross-Tenant BOLA via Tombstones
Description
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.
INFO
Published Date :
Aug. 19, 2026, 2:17 p.m.
Last Modified :
Sept. 11, 2026, 6:28 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update stigmem-node to version 0.9.0a12.
- Verify tenant isolation is correctly enforced.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-76236.
| URL | Resource |
|---|---|
| https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-x26h-xmv8-gxf7 | |
| https://www.vulncheck.com/advisories/stigmem-before-0a12-cross-tenant-bola-via-tombstones |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-76236 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-76236
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-76236 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-76236 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 21, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-76236', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-21T19:50:50.311416Z'} -
CVE Modified by [email protected]
Aug. 21, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'eidetic-labs', 'product': 'stigmem', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.9.0a12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '0.9.0a12', 'versionType': 'semver'}], 'packageURL': 'pkg:pypi/stigmem-node', 'defaultStatus': 'unaffected'}] [{'vendor': 'eidetic-labs', 'product': 'stigmem-node', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.9.0a12', 'versionType': 'python'}, {'status': 'unaffected', 'version': '0.9.0a12', 'versionType': 'python'}], 'packageURL': 'pkg:pypi/stigmem-node', 'defaultStatus': 'unaffected'}] -
New CVE Received by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'eidetic-labs', 'product': 'stigmem', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.9.0a12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '0.9.0a12', 'versionType': 'semver'}], 'packageURL': 'pkg:pypi/stigmem-node', 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-639 Added Reference https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-x26h-xmv8-gxf7 Added Reference https://www.vulncheck.com/advisories/stigmem-before-0a12-cross-tenant-bola-via-tombstones