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{"acknowledgement": "Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Bharadwaj Machiraju as the original reporter.", "affected_release": [{"advisory": "RHSA-2020:5238", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "thunderbird-0:78.5.0-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5257", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "firefox-0:78.5.0-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5235", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:78.5.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5239", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:78.5.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5236", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:78.5.0-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5237", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:78.5.0-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5240", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "thunderbird-0:78.5.0-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5314", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "firefox-0:78.5.0-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-12-01T00:00:00Z"}, {"advisory": "RHSA-2020:5231", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "thunderbird-0:78.5.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5233", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "firefox-0:78.5.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5232", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:78.5.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}, {"advisory": "RHSA-2020:5234", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "firefox-0:78.5.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2020-11-30T00:00:00Z"}], "bugzilla": {"description": "Mozilla: Use-after-free in WebRequestService", "id": "1898736", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1898736"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5."], "name": "CVE-2020-26959", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-11-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-26959\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-26959\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2020-51/#CVE-2020-26959"], "threat_severity": "Moderate"}