Vulnerability · Published Jan 23, 2026 · Assigned by fedora

CVE-2025-3839Epiphany: insecure external protocol invocation in epiphany

High 8.0

In plain English

A high-severity security flaw in epiphany. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.0High

Exploit odds (30 days)0.4%top 66.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	epiphany-browser	no fix listed	DEBIAN-CVE-2025-3839
Debian:13	epiphany-browser	48.1-1	DEBIAN-CVE-2025-3839
Debian:14	epiphany-browser	48.1-1	DEBIAN-CVE-2025-3839
Ubuntu:22.04:LTS	epiphany-browser	no fix listed	UBUNTU-CVE-2025-3839
Ubuntu:24.04:LTS	epiphany-browser	no fix listed	UBUNTU-CVE-2025-3839
Ubuntu:25.10	epiphany-browser	no fix listed	UBUNTU-CVE-2025-3839

Affected products (as reported)

Vendor	Product	Versions
	epiphany	0 – before 47.548.0 – before 48.1

Weakness: CWE-356 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

References

https://access.redhat.com/security/cve/CVE-2025-3839 vdb-entry, x_refsource_REDHAT
RHBZ#2361430 issue-tracking, x_refsource_REDHAT