CVE-2025-3839
Epiphany browser flaw allows code execution via external URL handlers triggered by UI.
Is CVE-2025-3839 being exploited?
Not confirmed. CVE-2025-3839 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 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2025-3839?
CVE-2025-3839 is rated High with a CVSS score of 8.0. 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-2025-3839?
Not known from our data. No patch reference has been recorded for CVE-2025-3839, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2025-3839 affect?
CVE-2025-3839 affects Epiphany (GNOME Web). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-3839?
Monitor for updates; apply patch when released; consider disabling external URL handlers if feasible.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Client-side code execution via external URL handler abuse triggered by trusted UI with minimal interaction.
Patch when possible