{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-2766", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2026-02-19T15:05:37.180Z", "datePublished": "2026-02-24T13:33:04.946Z", "dateUpdated": "2026-06-30T12:08:26.278Z" }, "containers": { "cna": { "affected": [ { "product": "Firefox", "vendor": "Mozilla", "versions": [ { "status": "unaffected", "version": "140.8", "lessThanOrEqual": "140.*", "versionType": "rpm" }, { "status": "unaffected", "version": "148", "lessThanOrEqual": "*", "versionType": "rpm" } ] }, { "product": "Thunderbird", "vendor": "Mozilla", "versions": [ { "status": "unaffected", "version": "140.8", "lessThanOrEqual": "140.*", "versionType": "rpm" }, { "status": "unaffected", "version": "148", "lessThanOrEqual": "*", "versionType": "rpm" } ] } ], "descriptions": [ { "lang": "en", "value": "Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8." } ] } ], "title": "Use-after-free in the JavaScript Engine: JIT component", "references": [ { "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2013583" }, { "url": "https://www.mozilla.org/security/advisories/mfsa2026-13/" }, { "url": "https://www.mozilla.org/security/advisories/mfsa2026-15/" }, { "url": "https://www.mozilla.org/security/advisories/mfsa2026-16/" }, { "url": "https://www.mozilla.org/security/advisories/mfsa2026-17/" } ], "credits": [ { "lang": "en", "value": "Evyatar Ben Asher, Keane Lucas, Nicholas Carlini, Newton Cheng, Daniel Freeman, Alex Gaynor, and Joel Weinberger using Claude from Anthropic" } ], "providerMetadata": { "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-13T13:53:14.602Z" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-416", "lang": "en", "description": 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AppStream EUS EXTENSION (v.8.4)", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:rhel_aus:8.6::appstream" ], "defaultStatus": "affected", "product": "Red Hat Enterprise Linux AppStream AUS (v.8.6)", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:rhel_e4s:8.6::appstream" ], "defaultStatus": "affected", "product": "Red Hat Enterprise Linux AppStream E4S (v.8.6)", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:rhel_tus:8.6::appstream" ], "defaultStatus": "affected", "product": "Red Hat Enterprise Linux AppStream TUS (v.8.6)", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:rhel_e4s:8.8::appstream" ], "defaultStatus": "affected", "product": "Red Hat Enterprise Linux AppStream E4S (v.8.8)", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:rhel_tus:8.8::appstream" ], "defaultStatus": "affected", "product": "Red Hat Enterprise Linux AppStream TUS (v.8.8)", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:rhel_e4s:9.0::appstream" ], "defaultStatus": "affected", "product": "Red Hat 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The Mozilla Foundation's Security Advisory describes the following issue:\nUse-after-free in the JavaScript Engine: JIT component" } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1" }, "format": "CVSS" } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-2766" }, { "name": "RHBZ#2442294", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442294" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2766.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:3984" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:3976" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:4260" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:3361" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:3517" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:3338" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:3515" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": 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Enterprise Linux AppStream E4S (v.9.0)" }, { "lang": "en", "value": "RHSA-2026:4152: Red Hat Enterprise Linux AppStream E4S (v.9.2)" }, { "lang": "en", "value": "RHSA-2026:3978: Red Hat Enterprise Linux AppStream E4S (v.9.2)" }, { "lang": "en", "value": "RHSA-2026:3496: Red Hat Enterprise Linux AppStream EUS (v.9.4)" }, { "lang": "en", "value": "RHSA-2026:3981: Red Hat Enterprise Linux AppStream EUS (v.9.4)" }, { "lang": "en", "value": "RHSA-2026:3497: Red Hat Enterprise Linux AppStream EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:3982: Red Hat Enterprise Linux AppStream EUS (v.9.6)" }, { "lang": "en", "value": "RHSA-2026:3339: Red Hat Enterprise Linux AppStream (v. 9)" }, { "lang": "en", "value": "RHSA-2026:3516: Red Hat Enterprise Linux AppStream (v. 9)" } ], "timeline": [ { "lang": "en", "time": "2026-02-24T14:02:36.100Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-02-24T13:33:04.946Z", "value": "Made public." } ], "title": "firefox: thunderbird: Use-after-free in the JavaScript Engine: JIT component", "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-06-30T12:08:26.278Z" } } ] } }