CVE-2026-76243: stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth

Severity: critical (CVSS 9.2 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-19 · updated 2026-09-24
Weakness: CWE-285

Description

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.

Affected products

eidetic-labs stigmem: before 0.9.0a2 — fixed in 0.9.0a2

How to fix

Upgrade to a fixed version: eidetic-labs stigmem 0.9.0a2. Check the vendor advisory for mitigations.

References

https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-fp6w-8wpg-74g5
https://www.vulncheck.com/advisories/stigmem-before-0a2-authentication-bypass-via-disabled-auth

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