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developers and community members Christian Holler, Valentin Gosu, and Andrew McCreight reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. 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.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43534.json","reference_id":"","reference_type":"","scores":[{"value":"8.8","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-43534.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43534","reference_id":"","reference_type":"","scores":[{"value":"0.00754","scoring_system":"epss","scoring_elements":"0.73182","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00754","scoring_system":"epss","scoring_elements":"0.73202","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00754","scoring_system":"epss","scoring_elements":"0.73172","published_at":"2026-04-01T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.7893","published_at":"2026-04-29T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.78913","published_at":"2026-04-26T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.78906","published_at":"2026-04-24T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.78854","published_at":"2026-04-13T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.78864","published_at":"2026-04-12T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.78883","published_at":"2026-04-16T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.7888","published_at":"2026-04-18T12:55:00Z"},{"value":"0.01193","scoring_system":"epss","scoring_elements":"0.78877","published_at":"2026-04-21T12:55:00Z"},{"value":"0.0163","scoring_system":"epss","scoring_elements":"0.8188","published_at":"2026-04-09T12:55:00Z"},{"value":"0.0163","scoring_system":"epss","scoring_elements":"0.81847","published_at":"2026-04-07T12:55:00Z"},{"value":"0.0163","scoring_system":"epss","scoring_elements":"0.81874","published_at":"2026-04-08T12:55:00Z"},{"value":"0.0163","scoring_system":"epss","scoring_elements":"0.819","published_at":"2026-04-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43534"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38496","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38496"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38500","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38500"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38502","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38502"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38503","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38503"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38504","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38504"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38506","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38506"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38507","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38507"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38508","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38508"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38509","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38509"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4126","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4126"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4129","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4129"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43528","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43528"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43529","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43529"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43534","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?nam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use-after-free could have occurred when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable 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