CVE-2026-118599

{
  "id": "CVE-2026-118599",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-31T10:16:38.060",
  "lastModified": "2026-10-31T10:16:38.060",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A file overwrite vulnerability exists in Epiphany when installing WebExtension packages from .xpi files.\n\nIn 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.\n\nThis is related to but separate from the ZIP-slip path traversal fixed as CVE-2026-77679 (#2922 / MR !2143).\n\nRequirements: the victim must install or open a malicious WebExtension (.xpi).\n\nAffected: Epiphany >= 47.0 (WebExtension XPI install path).\nFixed: https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2248 (commit 0cc9ab55 — only enable ZIP format support).\nUpstream: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2988\nReporter acknowledgment: Fernando Munoz"
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "GNOME",
          "product": "Epiphany",
          "defaultStatus": "unaffected",
          "collectionURL": "https://gitlab.gnome.org/GNOME/epiphany",
          "packageName": "epiphany",
          "versions": [
            {
              "version": "47.0",
              "lessThan": "*",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://access.redhat.com/security/cve/CVE-2026-118599",
      "source": "[email protected]"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562969",
      "source": "[email protected]"
    },
    {
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2248",
      "source": "[email protected]"
    },
    {
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2988",
      "source": "[email protected]"
    }
  ]
}