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Critical, CVSS 9.2amended

stigmem-node: Auth-disabled deployments may grant broad anonymous access outside loopback

CVE-2026-76243GHSA-fp6w-8wpg-74g5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (stigmem-node 0.9.0a2), 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
9.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-76243: 0.56% estimated exploitation activity in the next 30 days; percentile 46.94 (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.

Impact Stigmem nodes configured with authentication disabled could grant the anonymous identity broad read/write/federation capabilities if exposed outside a loopback-only local development environment. Impacted users are operators who intentionally disabled authentication while binding the node to a non-loopback URL. Patches Patched in 0.9.0a2. The node now refuses unauthenticated operation outside loopback-only local development. Workarounds Before upgrading, keep authentication enabled for all non-local deployments and do not expose nodes with authentication disabled to untrusted networks. Upgrade Upgrade to the patched release: If developers install through the Stigmem meta-package instead, they should use the matching extra for their deployments, for example: Resources - Release: https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2 - Changelog: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35 - Security policy and posture:…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-fp6w-8wpg-74g5

  2. Revision 3 · amended ·

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

  3. Revision 2 · amended ·

    Amended from osv record GHSA-fp6w-8wpg-74g5

  4. Revision 1 · created ·

    Published from ghsa record GHSA-fp6w-8wpg-74g5

Agent brief

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# Patch Next advisory brief: CVE-2026-76243

Advisory: stigmem-node: Auth-disabled deployments may grant broad anonymous access outside loopback
IDs: CVE-2026-76243, GHSA-fp6w-8wpg-74g5
Record: https://patchnext.com/advisories/ghsa-fp6w-8wpg-74g5 (revision 4, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: stigmem-node 0.9.0a2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI stigmem-node: affected < 0.9.0a2; fixed in 0.9.0a2

## 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://github.com/advisories/GHSA-fp6w-8wpg-74g5 (GitHub-reviewed advisory GHSA-fp6w-8wpg-74g5 lists affected ranges: PyPI stigmem-node >=0 <0.9.0a2)
- Verified: https://osv.dev/vulnerability/GHSA-fp6w-8wpg-74g5 (OSV record GHSA-fp6w-8wpg-74g5 lists affected ranges: PyPI stigmem-node >=0 <0.9.0a2 (fixed))

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