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Vulnerability record · CVE-2026-76244 · published 19 August 2026

CVE-2026-76244: Cleartext transmission vulnerability

stigmem-node contains an insecure default configuration vulnerability that allows federation traffic to traverse networks without mTLS protection when non-loopback endpoints are enabled. Operators who explicitly disabled mTLS while binding federation to non-loopback addresses expose federation traffic to cleartext interception and man-in-the-middle attacks.

9.1 CVSS 4.0 Critical EPSS 0.27% · top 83.0% CWE-319 · Cleartext transmission Deferred
9.1CVSS 4.0 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
11 Sep 2026Last modified by NVD

Description

stigmem-node contains an insecure default configuration vulnerability that allows federation traffic to traverse networks without mTLS protection when non-loopback endpoints are enabled. Operators who explicitly disabled mTLS while binding federation to non-loopback addresses expose federation traffic to cleartext interception and man-in-the-middle attacks.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-jmfc-hfjq-pxcp
https://www.vulncheck.com/advisories/stigmem-node-insecure-federation-transport-configuration

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Source: NIST National Vulnerability Database (record CVE-2026-76244), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.