CVE-2026-79992 Red Hat CVE debrief

Who should care

Defenders responsible for Emacs installations, especially in environments where untrusted filenames may be processed, should assess exposure and prioritize patching. This includes system administrators, security teams, and IT personnel who manage Emacs installations. They should review the official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

Defenders should prioritize patching Emacs installations to prevent potential command injection attacks, especially in environments where untrusted filenames may be processed.

• Potential for arbitrary code execution via crafted filenames
• Need for sanitization of login arguments in TRAMP configurations
• Importance of monitoring for suspicious filename processing activity

Technical summary

The vulnerability in Emacs TRAMP occurs because it concatenates login arguments without proper sanitization, which are then passed to a local shell. This could allow a local attacker to exploit via crafted filenames, potentially leading to arbitrary code execution. The exploitation of this vulnerability is particularly concerning because it can be done by a local attacker, which may already have access to the system. Defenders should be aware of the potential for this vulnerability to be exploited in environments where untrusted filenames may be processed.

Defensive priority

Defenders should prioritize patching Emacs installations, especially in environments where untrusted filenames may be processed.

Recommended defensive actions

• Patch Emacs installations to prevent potential command injection attacks
• Review and update TRAMP configurations to ensure proper sanitization of login arguments
• Monitor for suspicious filename processing activity in Emacs environments
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The CVE record and source item provide details on the vulnerability in Emacs TRAMP. However, specific versions affected and patched are not provided in the corpus. Further verification is needed to determine the exact scope of the vulnerability and to identify any potential mitigations. Defenders should review the official advisory or CVE record to validate affected scope, severity, and vendor guidance.

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.