- Son 7 gün
- CWE-59
CVE-2026-118599
epiphany: TAR-based .xpi with hard links can overwrite user files during WebExtension install
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- Güncellendi
- 31 Eki 2026
- Açık yaşı
- 0 gün
- Kaydı açan
- fedora
Özet
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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
Etkilenen sürümler1 yazılım
| Yazılım | Etkilenen | Düzeltildiği sürüm |
|---|---|---|
| GNOME Epiphany | ≥ 47.0 | – |
Kaynaklar6 kaynak
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