CVE-2026-76236 json
stigmem before 0.9.0a12 Cross-Tenant BOLA via Tombstones
published 2026-06-19 4 mo ago modified 2026-09-11 58 d ago also GHSA-x26h-xmv8-gxf7 , EUVD-2026-62476
- cvss
- 7.2
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
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, 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.
Patch / fix
- pypi stigmem-node 0.9.0a12
- eidetic-labs stigmem-node 0.9.0a12
- github.com/eidetic-labs/stigmem#728 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.2 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N |
| CNA | 4.0 | 7.2 | CVSS:4.0/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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | stigmem-node | <0.9.0a12 |
0.9.0a12 |
Affected products
- eidetic-labs stigmem-node
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
github.com
/eidetic-labs/stigmem/pull/728
web
-
github.com
/eidetic-labs/stigmem/security/advisories/GHSA-x26h-xmv8-gxf7
vendor-advisory, web
-
vulncheck.com
/advisories/stigmem-before-0a12-cross-tenant-bola-via-tombstones
third-party-advisory
-
github.com
/eidetic-labs/stigmem
package
Sources
- CVE List CVE-2026-76236
- GitHub Advisory GHSA-x26h-xmv8-gxf7
- NVD CVE-2026-76236
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