What’s Vulnerable › Vulnerabilities

CVE-2026-76242: stigmem Federation Peer Registration Authentication Bypass

• Severity: critical (CVSS 9.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-09-11
• Weakness: CWE-295

Description

stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.

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-9vp8-3hmv-8fgh
• https://www.vulncheck.com/advisories/stigmem-federation-peer-registration-authentication-bypass

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