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Back to active CVEs
Medium · CVSS 5.5CVE-2026-118599

epiphany: TAR-based .xpi with hard links can overwrite user files during WebExtension installCVE-2026-118599

Answer in brief

CVE-2026-118599 records a Medium severity (CVSS 5.5) vulnerability in epiphany: TAR-based .xpi with hard links can overwrite user files during WebExtension install. The current sources do not mark it as known exploited. The current feed maps GNOME/epiphany (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 31, 2026Updated Oct 31, 2026Source checked Oct 31, 2026First seen by HOL Oct 31, 2026Material review Oct 31, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps GNOME/epiphany (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
GNOME/epiphanygeneric>=47.0 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for GNOME/epiphany.
  2. 2Review the reported fix. Source-reported workaround: Do not install WebExtensions (.xpi) from untrusted sources. Prefer keeping WebExtensions disabled when unused (Epiphany can refuse install when the feature is disabled in recent fixes). After any untrusted .xpi install attempt, inspect unexpectedly modified user files (for example shell startup files, autostart desktop entries, or SSH authorized_keys). Upgrade to a fixed Epiphany build containing MR !2248 / commit 0cc9ab55 when available for your stream.

Evidence timeline and material changes

  1. Published upstream

    Oct 31, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 31, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 31, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencegitlab.gnome.org
  • Source referencegitlab.gnome.org
Upstream source 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'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

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • epiphany: clipboard/website-data permission prompt incorrectly grants camera and microphone accessSame gnome/epiphany package

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-59
Source
CVE List V5
Source checked
Oct 31, 2026
References
4 linked sources
Open source record