---
id: CVE-2026-76243
title: >-
  stigmem versions before 0.9.0a2 allow unauthenticated access when
  authentication is disabled on non-loopback deployments
summary: >-
  stigmem versions before 0.9.0a2 allow unauthenticated access when
  authentication is disabled on non-loopback deployments. Attackers can perform
  read, write, and federation operations with anonymous identity when nodes are
  exposed outside…
severity: critical
cwe:
  - CWE-285
vendor: stigmem-node
product: stigmem-node
affected:
  - stigmem-node < 0.9.0a2
patched:
  - stigmem-node 0.9.0a2
published: '2026-08-19'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:43:32.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76243'
references:
  - url: >-
      https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-fp6w-8wpg-74g5
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/stigmem-before-0a2-authentication-bypass-via-disabled-auth
    label: disclosure@vulncheck.com
  - url: 'https://github.com/eidetic-labs/stigmem'
  - url: 'https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35'
  - url: 'https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md'
  - url: 'https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2'
tags:
  - nvd
  - osv
  - pip
epss: 0.00564
epssPercentile: 0.46711
aliases:
  - GHSA-fp6w-8wpg-74g5
ecosystem: pip
ingestedAt: '2026-08-20T19:23:05.949Z'
---

## Overview

stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-76243)

Affected packages:

- `stigmem-node < 0.9.0a2`

Patched in:

- `stigmem-node 0.9.0a2`

Source: https://osv.dev/vulnerability/GHSA-fp6w-8wpg-74g5