CVE-2026-49258
Authenticated non-admin operators can access or modify other operators' hosts and networks via Nebula Mesh UI.
Is CVE-2026-49258 being exploited?
Not confirmed. CVE-2026-49258 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.28% probability of exploitation in the next 30 days.
How severe is CVE-2026-49258?
CVE-2026-49258 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-49258?
Yes. A fix has been recorded for CVE-2026-49258. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49258 affect?
CVE-2026-49258 affects Nebula Mesh (<= 0.3.5), Web UI (/ui/*). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49258?
Upgrade to Nebula Mesh 0.3.6; disable self-registration and audit/restrict operator accounts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated non-admin can read, block, or delete other operators' hosts and networks via the web UI, causing data exposure and service disruption.
Patch when possible
- affected< 0.3.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.