{
  "cveId": "CVE-2026-118599",
  "url": "https://patchblox.com/security/cve/CVE-2026-118599",
  "summary": "CVE-2026-118599 is fixed in epiphany-browser on 1 platform by DEBIAN-CVE-2026-118599 (version 51.2-1), released November 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "epiphany-browser: A file overwrite vulnerability exists in Epiphany when installing WebExtension packages from .xpi files",
  "description": "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\u0027s 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 \u003E= 47.0 (WebExtension XPI install path). Fixed: https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2248 (commit 0cc9ab55 \u2014 only enable ZIP format support). Upstream: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2988 Reporter acknowledgment: Fernando Munoz",
  "published": "2026-10-31T10:16:38Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
  "epss": 0.00182,
  "epssPercentile": 0.07792,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "epiphany-browser",
      "release": "Debian 14",
      "fixedVersion": "51.2-1",
      "fix": "DEBIAN-CVE-2026-118599",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-118599",
      "released": "2026-11-04T19:14:43Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}