Bug 2520891 (CVE-2026-77679) - CVE-2026-77679 epiphany: epiphany: path traversal in WebExtension XPI extraction (ZIP slip)
Summary: CVE-2026-77679 epiphany: epiphany: path traversal in WebExtension XPI extract...
Keywords:
Status: NEW
Alias: CVE-2026-77679
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2522048
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-21 04:51 UTC by OSIDB Bzimport
Modified: 2026-08-24 16:12 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-08-21 04:51:54 UTC 
A flaw was found in Epiphany's WebExtension XPI installer. When extracting a .xpi archive, decompress_xpi_thread() in ephy-web-extension-manager.c passed archive entry pathnames directly to libarchive without ARCHIVE_EXTRACT_SECURE_NODOTDOT or ARCHIVE_EXTRACT_SECURE_SYMLINKS. A crafted XPI containing path traversal sequences (../) could write files outside the intended web_extensions extraction directory to arbitrary locations writable by the user, potentially leading to code execution on next login or shell start. Fixed upstream in epiphany 50.6 and 49.9 (GitLab MR !2143).
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