CVE-2026-0889

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{"bugzilla": {"description": "firefox: Denial-of-service in the DOM: Service Workers component", "id": "2428964", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2428964"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-0889", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-13T13:30:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-0889\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0889\nhttps://www.mozilla.org/security/advisories/mfsa2026-01/#CVE-2026-0889"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-15T17:40:16.080804+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox to version 147 or later.", "Upgrade Thunderbird to version 147 or later.", "Disable Service Workers for untrusted origins if an immediate upgrade is not possible."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Mozilla Thunderbird are impacted. All versions prior to Firefox 147 and Thunderbird 147 are vulnerable, as the issue was fixed in these releases. Any installation of earlier versions that still contain the original Service Workers implementation is at risk.", "description_and_impact": "The vulnerability resides in the Service Workers component of the browser\u2019s Document Object Model (DOM) implementation. It can be triggered by malicious content that exploits the component\u2019s resource handling, leading to a denial of service where the browser becomes unresponsive and users are unable to interact with web content or the application itself.", "risk_and_exploitability": "The CVSS score of 7.5 indicates high severity, but the EPSS score is below 1%, suggesting a low likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog. Based on the description, the likely attack vector involves a malicious website or script that registers a Service Worker to exhaust resources or repeatedly manipulate the DOM, causing the browser to freeze. The attack would typically require a user to visit or interact with such content, and does not appear to allow remote code execution or privilege escalation beyond the affected application."}}}}, "created": "2026-01-14T11:09:20.686209+00:00", "updated": "2026-04-15T18:15:10.871422+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}