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    CVE-2026-118599

    A file overwrite vulnerability exists in Epiphany when installing WebExtension packages from .xpi files. In src/webextension/ephy-web-extension-manager.c, decompress_xpi_thread() used libarchive with archive_read_support_format_all() (and filters), so the installer did not require a real ZIP. A TAR file named *.xpi was extracted. TAR supports hard-link entry types; with Epiphany's archive_write_disk options (including ARCHIVE_EXTRACT_PERM), a crafted hard-link target can cause an attacker-chosen existing user-writable file to be truncated and overwritten with attacker-controlled content and mode bits, without a dedicated warning dialog, when the user installs or opens the crafted .xpi. This is related to but separate from the ZIP-slip path traversal fixed as CVE-2026-77679 (#2922 / MR !2143). Requirements: the victim must install or open a malicious WebExtension (.xpi). Affected: Epiphany >= 47.0 (WebExtension XPI install path). Fixed: https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2248 (commit 0cc9ab55 — only enable ZIP format support). Upstream: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2988 Reporter acknowledgment: Fernando Munoz

    Published:Oct 24, 2026
    Last Modified:Oct 30, 2026
    EPS:N/A
    EPSS Score:
    CVSS Score:5.5

    Affected Products

    Vendor
    Gnome
    Product
    Epiphany

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-77682 (CVSS 7.1) — A code injection vulnerability exists in Epiphany when the user invokes form autofill from the context menu on…
    CVE-2026-18487 (CVSS 5.4) — A flaw was found in Epiphany. An issue in how the browser reads web addresses allows attackers to fake the dom…
    CVE-2025-3839 (CVSS 8) — A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minim…
    CVE-2023-26081 (CVSS 7.5) — In Epiphany (aka GNOME Web) through 43.0, untrusted web content can trick users into exfiltrating passwords, b…
    CVE-2022-29536 (CVSS 7.5) — In GNOME Epiphany before 41.4 and 42.x before 42.2, an HTML document can trigger a client buffer overflow (in …
    CVE-2021-45086 (CVSS 6.1) — XSS can occur in GNOME Web (aka Epiphany) before 40.4 and 41.x before 41.1 because a server's suggested_filena…
    CVE-2021-45087 (CVSS 6.1) — XSS can occur in GNOME Web (aka Epiphany) before 40.4 and 41.x before 41.1 when View Source mode or Reader mod…
    CVE-2021-45088 (CVSS 6.1) — XSS can occur in GNOME Web (aka Epiphany) before 40.4 and 41.x before 41.1 via an error page.…

    References

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-118599 — Gnome | CVE-DB