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"package": "thunderbird-0:128.7.0-1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-02-11T00:00:00Z"}], "bugzilla": {"description": "firefox: thunderbird: Use-after-free in XSLT", "id": "2343760", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2343760"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability affects Firefox < 135, Firefox ESR < 115.20, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135.", "A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash."], "name": "CVE-2025-1009", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "thunderbird-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-04T13:58:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-1009\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-1009\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1936613\nhttps://www.mozilla.org/security/advisories/mfsa2025-07/\nhttps://www.mozilla.org/security/advisories/mfsa2025-08/\nhttps://www.mozilla.org/security/advisories/mfsa2025-09/\nhttps://www.mozilla.org/security/advisories/mfsa2025-10/\nhttps://www.mozilla.org/security/advisories/mfsa2025-11/"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-20T18:31:20.748135+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox to 135 or later, including ESR 115.20 and ESR 128.7.", "Upgrade Thunderbird to 128.7 or 135.", "If upgrading immediately is not feasible, configure the browser to block or disable XSLT processing (for example, adjust the about:config setting for XSLT processing) to reduce risk.", "Disable or remove any extensions or add\u2011ons that inject or manipulate XSLT content until an update is applied."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution (potential)"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox versions prior to 135, including Firefox ESR 115.20 and 128.7, and all Mozilla Thunderbird releases before 128.7 and 135 are affected. The same flaw may impact Red\u202fHat Enterprise Linux deriving from packages that embed the vulnerable libraries, as indicated by several Red\u202fHat CPE entries.", "description_and_impact": "A use\u2011after\u2011free flaw was found in the XSLT processing engine, allowing an attacker to supply crafted XSLT data that leads to a crash. The flaw is marked as CWE\u2011416 and could potentially be leveraged to achieve arbitrary code execution, compromising system confidentiality and integrity.", "risk_and_exploitability": "The CVSS score of 9.8 indicates critical severity, and the EPSS score of less than 1% implies low current exploitation probability. The vulnerability is not listed in the CISA KEV catalog. Attackers are likely to trigger the flaw by delivering a malicious XSLT file or URL that is processed by the victim\u2019s browser or email client, making the most probable vector user interaction with crafted content."}}}}, "created": "2026-04-20T18:45:14.237334+00:00", "updated": "2026-04-20T18:45:14.237357+00:00", "vendors": []}