{ "cveId": "CVE-2026-5731", "url": "https://patchblox.com/security/cve/CVE-2026-5731", "summary": "CVE-2026-5731 is fixed in 241 products on 2 platforms, first by Mozilla Firefox ESR (ach) 140.9.1, released April 7, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2", "description": "Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.", "published": "2026-04-07T12:43:11Z", "severity": "important", "cvss": 9.8, "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "cwe": "CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer", "epss": 0.00353, "epssPercentile": 0.29186, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2026-5731", "fixes": [ { "platform": "windows-app", "product": "Mozilla Firefox ESR (ach)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ach) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ach-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (af)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (af) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.af-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (an)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (an) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.an-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ar)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ar) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ar-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ast)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ast) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ast-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (az)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (az) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.az-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (be)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (be) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.be-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (bg)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (bg) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.bg-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (bn)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (bn) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.bn-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (br)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (br) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.br-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (bs)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (bs) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.bs-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ca)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ca) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ca-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ca-valencia)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ca-valencia) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ca-valencia-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (cak)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (cak) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.cak-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (cs)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (cs) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.cs-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (cy)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (cy) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.cy-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (da)", 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"platform": "windows-app", "product": "Mozilla Firefox ESR (en-CA)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (en-CA) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.en-ca-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (en-GB)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (en-GB) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.en-gb-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (en-US)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (en-US) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (eo)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (eo) 140.9.1", "url": 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}, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ff)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ff) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ff-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (fi)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (fi) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.fi-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (fr)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (fr) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.fr-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (fur)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (fur) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.fur-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (fy-NL)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (fy-NL) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.fy-nl-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ga-IE)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ga-IE) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ga-ie-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (gd)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (gd) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.gd-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (gl)", 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"https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.hu-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (hy-AM)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (hy-AM) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.hy-am-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ia)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ia) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ia-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (id)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (id) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.id-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (is)", 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"platform": "windows-app", "product": "Mozilla Firefox ESR (kab)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (kab) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.kab-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (kk)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (kk) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.kk-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (km)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (km) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.km-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (kn)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (kn) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.kn-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ko)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ko) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ko-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (lij)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (lij) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.lij-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (lt)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (lt) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.lt-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (lv)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (lv) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.lv-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (mk)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (mk) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.mk-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (mr)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (mr) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.mr-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", "product": "Mozilla Firefox ESR (ms)", "fixedVersion": "140.9.1", "fix": "Mozilla Firefox ESR (ms) 140.9.1", "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.esr.ms-140.9.1", "released": "2026-04-07T00:00:00Z" }, { "platform": "windows-app", 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