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`UpdateRegExpStatics` attempted to access `initialStringHeap` it could already have been garbage collected prior to entering the function, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 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safety bugs present in Firefox 116, Firefox ESR 115.1, and Thunderbird 115.1. 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 affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 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receiving rendering data over IPC `mStream` could have been destroyed when initialized, which could have led to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox < 117, Firefox ESR < 102.15, Firefox ESR < 115.2, Thunderbird < 102.15, and Thunderbird < 115.2.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-4573.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-4573.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-4573","reference_id":"","reference_type":"","scores":[{"value":"0.00137","scoring_system":"epss","scoring_elements":"0.33437","published_at":"2026-06-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-4573"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4573","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4573"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4574","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4574"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4575","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4575"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4581","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4581"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4584","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4584"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2236071","reference_id":"2236071","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2236071"},{"reference_url":"https://security.gentoo.org/glsa/202402-25","reference_id":"GLSA-202402-25","reference_type":"","scores":[],"url":"https://security.gentoo.org/glsa/202402-25"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-34","reference_id":"mfsa2023-34","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-34"},{"reference_url":"https://www.mozilla.org/security/advisories/mfsa2023-34/","reference_id":"mfsa2023-34","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-09-26T15:08:18Z/"}],"url":"https://www.mozilla.org/security/advisories/mfsa2023-34/"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-35","reference_id":"mfsa2023-35","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-35"},{"reference_url":"https://www.mozilla.org/security/advisories/mfsa2023-35/","reference_id":"mfsa2023-35","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-09-26T15:08:18Z/"}],"url":"https://www.mozilla.org/security/advisories/mfsa2023-35/"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-36","reference_id":"mfsa2023-36","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-36"},{"reference_url":"https://www.mozilla.org/security/advisories/mfsa2023-36/","reference_id":"mfsa2023-36","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-09-26T15:08:18Z/"}],"url":"https://www.mozilla.org/security/advisories/mfsa2023-36/"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-37","reference_id":"mfsa2023-37","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-37"},{"reference_url":"https://www.mozilla.org/security/advisories/mfsa2023-37/","reference_id":"mfsa2023-37","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-09-26T15:08:18Z/"}],"url":"https://www.mozilla.org/security/advisories/mfsa2023-37/"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-38","reference_id":"mfsa2023-38","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2023-38"},{"reference_url":"https://www.mozilla.org/security/advisories/mfsa2023-38/","reference_id":"mfsa2023-38","reference_type":"","scores":[{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-09-26T15:08:18Z/"}],"url":"https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calling `JS::CheckRegExpSyntax` a Syntax Error could have been set which would end in calling `convertToRuntimeErrorAndClear`. A path in the function could attempt to allocate memory when none is available which would have caused a newly created Out of Memory exception to be mishandled as a Syntax Error. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 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