Vulnerability · Published Aug 19, 2026 · Assigned by VulnCheck

CVE-2026-76242stigmem Federation Peer Registration Authentication Bypass

Critical 9.1

In plain English

A critical-severity improper certificate validation in stigmem from eidetic-labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.1Critical

Exploit odds (30 days)0.3%top 71.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	stigmem-node	0.9.0a2	GHSA-9vp8-3hmv-8fgh

Affected products (as reported)

Vendor	Product	Versions
eidetic-labs	stigmem	0 – before 0.9.0a2

Weakness: CWE-295 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

GitHub Security Advisory (GHSA-9vp8-3hmv-8fgh) vendor-advisory
VulnCheck Advisory: stigmem Federation Peer Registration Authentication Bypass third-party-advisory