Vulnerability in stigmem-node (CVE-2026-76236)
Summary
Vulnerability in stigmem-node (CVE-2026-76236). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.9.0a12 or later.
Original description
The description as published by the source.
Summary
On a multi-tenant stigmem node, RTBF (right-to-be-forgotten) tombstones were mis-scoped two ways. (1) issue_tombstone defaulted the tenant to "default" instead of the caller's tenant, so tombstones could be written to the wrong tenant. (2) The read-suppression path — _get_tombstone_filter (routes/facts/common.py) and the _tombstone_scope_cache (lifecycle/tombstones.py) — had no tenant_id predicate, so tombstone suppression was applied tenant-blind across fact queries and provenance. Reached via /v1/tombstones and the fact query/provenance read paths.
Impact
Cross-tenant integrity of the RTBF mechanism: a tenant's deletion request could be recorded against the wrong tenant, and tombstone suppression could hide — or fail to hide — facts across tenant boundaries, undermining both data-view correctness and RTBF guarantees.
Affected configurations
This is a cross-tenant break. It is exploitable only on deployments running the opt-in stigmem-plugin-multi-tenant (multiple tenants on one node). A default single-tenant node has only tenant="default" — there is no second tenant to cross — so it is not exploitable on default deployments. The rating is HIGH for the multi-tenant deployments the plugin exists to isolate.
Patches
Fixed in 0.9.0a12 (PR #728): identity.tenant_id is passed from issue_tombstone into create_tombstone (no more "default" fallback); AND tenant_id = ? was added to _get_tombstone_filter and `get…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-76236 has been found in stigmem-node.
Risk of unauthorized operations or information disclosure.
What to do: upgrade stigmem-node to 0.9.0a12 or later.
If unsure, ask your IT team or search "stigmem-node CVE-2026-76236" on the vendor's site.
CVE-2026-76236 (stigmem-node) — CWE-639
Patched: 0.9.0a12 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-639) exists in stigmem-node.
Check the vendor advisory for the affected versions of stigmem-node.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 0.9.0a12.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'stigmem-node' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'stigmem-node' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
stigmem-nodeを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade stigmem-node to 0.9.0a12ステージング環境で 0.9.0a12 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- package github.com
- web github.com
- web disclosure@vulncheck.com
- web nvd.nist.gov
- web github.com
- web github.com