CVE-2026-76244 eidetic-labs CVE debrief

Who should care

Operators who explicitly disabled mTLS while binding federation to non-loopback addresses should verify and remediate their configurations to prevent cleartext interception and man-in-the-middle attacks.

Why it matters

CVE-2026-76244 is a critical vulnerability in stigmem-node that allows cleartext federation traffic interception and man-in-the-middle attacks when non-loopback endpoints are enabled and mTLS is disabled. Operators should verify and remediate their configurations to prevent these attacks.

• Cleartext interception of federation traffic is possible
• Man-in-the-middle attacks against federation traffic are possible
• Verification of stigmem-node configurations is required
• Remediation of insecure configurations is necessary

Technical summary

The stigmem-node package contains an insecure default configuration vulnerability that allows federation traffic to traverse networks without mTLS protection when non-loopback endpoints are enabled. This vulnerability exposes operators who explicitly disabled mTLS while binding federation to non-loopback addresses to cleartext interception and man-in-the-middle attacks. The vulnerability has a CVSS score of 9.1 and is considered critical. Operators should verify and remediate their configurations to prevent these attacks.

Defensive priority

Operators should verify and remediate insecure configurations

Recommended defensive actions

• Verify stigmem-node configurations for insecure federation transport settings
• Disable non-loopback endpoints or enable mTLS protection
• Monitor federation traffic for cleartext interception attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the insecure default configuration vulnerability in stigmem-node. The vulnerability 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 are exposed to cleartext interception and man-in-the-middle attacks. The CVE record was published on 2026-08-19T14:17:56.827Z and has not been modified since then. There are no known affected scope or scope

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.