Vulnerability in Zen (CVE-2026-44659)
Summary
Vulnerability in Zen (CVE-2026-44659). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.19.12b or later.
Original description
The description as published by the source.
Zen is a firefox-based browser. Prior to 1.19.12b, the ZEN Browser incorrectly truncates long hostnames in the address bar and shows only the attacker-controlled prefix of the subdomain, hiding the actual registrable domain (eTLD+1). As a result, an attacker can craft extremely long malicious subdomains that visually imitate trusted brands, and the browser will display only the spoofed prefix, misleading users about the actual origin of the site. This directly compromises the URL bar as a security indicator and creates a phishing/supply-chain attack vector. This vulnerability is fixed in 1.19.12b.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-44659 has been found in Zen.
Risk of unauthorized operations or information disclosure. CVSS score: 4.7/10.
What to do: upgrade Zen to 1.19.12b or later.
If unsure, ask your IT team or search "Zen CVE-2026-44659" on the vendor's site.
CVE-2026-44659 (Zen) — CWE-451 / CVSS v3 4.7
Attack vector: remote (network-reachable) / unauthenticated
Patched: 1.19.12b — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-451) exists in Zen.
Check the vendor advisory for the affected versions of Zen.
Severity: Medium (CVSS 4.7/10). Risk of unauthorized operations or information disclosure.
Update to 1.19.12b.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Zen' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'Zen' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Zenを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade Zen to 1.19.12bステージング環境で 1.19.12b に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov