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High, CVSS 7.2amended

stigmem-node: RTBF tombstones are mis-attributed and suppress reads tenant-blind (cross-tenant BOLA)

CVE-2026-76236GHSA-x26h-xmv8-gxf7

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (stigmem-node 0.9.0a12), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 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 · score source
EPSS
  • CVE-2026-76236: 0.36% estimated exploitation activity in the next 30 days; percentile 30.33 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary On a multi-tenant stigmem node, RTBF (right-to-be-forgotten) tombstones were mis-scoped two ways. (1) issuetombstone 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 — gettombstonefilter (routes/facts/common.py) and the tombstonescopecache (lifecycle/tombstones.py) — had no tenantid 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…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-x26h-xmv8-gxf7

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-x26h-xmv8-gxf7

Agent brief

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# Patch Next advisory brief: CVE-2026-76236

Advisory: stigmem-node: RTBF tombstones are mis-attributed and suppress reads tenant-blind (cross-tenant BOLA)
IDs: CVE-2026-76236, GHSA-x26h-xmv8-gxf7
Record: https://patchnext.com/advisories/cve-2026-76236 (revision 3, source checked 26 Oct 2026, 13:46 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: stigmem-node 0.9.0a12. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI stigmem-node: affected < 0.9.0a12; fixed in 0.9.0a12

## Suggested inspection (read-only)
- `python -m pip show stigmem-node`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on stigmem-node.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-x26h-xmv8-gxf7 (OSV record GHSA-x26h-xmv8-gxf7 lists affected ranges: PyPI stigmem-node >=0 <0.9.0a12 (fixed))
- Verified: https://github.com/advisories/GHSA-x26h-xmv8-gxf7 (GitHub-reviewed advisory GHSA-x26h-xmv8-gxf7 lists affected ranges: PyPI stigmem-node >=0 <0.9.0a12)

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