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

CVSS 7.2 · High EPSS 0.27% · P19

Affected Version Matrix 2

VendorProductVersion RangeStatus
eidetic-labsstigmem< 0.9.0a12affected
0.9.0a12unaffected
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I. Basic Information for CVE-2026-76236

Vulnerability Information
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Vulnerability Title
stigmem before 0.9.0a12 Cross-Tenant BOLA via Tombstones
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
eidetic-labsstigmem 0 ~ 0.9.0a12 -

II. Public POCs for CVE-2026-76236

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9361 chars
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III. Intelligence Information for CVE-2026-76236

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Vendor Advisories for CVE-2026-76236 (2)

Same Patch Batch · eidetic-labs · 2026-08-19 · 10 CVEs total

CVE-2026-762439.2 CRITICALstigmem before 0.9.0a2 Authentication Bypass via Disabled Auth
CVE-2026-762429.1 CRITICALstigmem Federation Peer Registration Authentication Bypass
CVE-2026-762449.1 CRITICALstigmem-node Insecure Federation Transport Configuration
CVE-2026-762378.6 HIGHstigmem before 0.9.0a12 Cross-Tenant BOLA via quarantine
CVE-2026-762407.5 HIGHstigmem Postgres SQL Injection via Schema Identifier
CVE-2026-762417.3 HIGHstigmem Plugin Signature Enforcement Bypass via Configuration
CVE-2026-762387.2 HIGHstigmem before 0.9.0a12 Cross-Tenant BOLA via decay sweep
CVE-2026-762457.1 HIGHstigmem Federation Peer Token Timestamp Validation Bypass
CVE-2026-762396.3 MEDIUMStigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address

IV. Related Vulnerabilities

Same product: stigmem
Same vendor: eidetic-labs
Same weakness: CWE-639

V. Comments for CVE-2026-76236

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