{"answers":{"affected":"It affects 3 products.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-26950 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2020-26950 is a high-severity use after free vulnerability in Mozilla Firefox, published on 9 Dec 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2020-26950 and fix it if it is affected.\n\nWhat it is: CVE-2020-26950 is a high-severity use after free vulnerability in Mozilla Firefox, published on 9 Dec 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-26950 exists.\n\nAffected product: Mozilla Firefox. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2020-26950/ (Markdown: https://insights.sbomify.com/CVE-2020-26950/index.md)","id":"CVE-2020-26950","markdown":"https://insights.sbomify.com/CVE-2020-26950/index.md","name":"CVE-2020-26950","record":{"aliases":["DEBIAN-CVE-2020-26950","DLA-2448-1","DLA-2449-1","DSA-4788-1","DSA-4790-1","GHSA-cp22-2989-32j9","MGASA-2020-0421","OESA-2024-1562","OESA-2024-1563","RHSA-2020:5099","RHSA-2020:5100","RHSA-2020:5104","RHSA-2020:5135","RHSA-2020:5138","RHSA-2020:5139","RHSA-2020:5146","RHSA-2020:5162","RHSA-2020:5163","RHSA-2020:5164","RHSA-2020:5166","RHSA-2020:5167","SUSE-SU-2020:14542-1","SUSE-SU-2020:3311-1","SUSE-SU-2020:3312-1","SUSE-SU-2020:3331-1","SUSE-SU-2020:3418-1","UBUNTU-CVE-2020-26950","USN-4625-1","openSUSE-SU-2020:1909-1","openSUSE-SU-2020:1919-1","openSUSE-SU-2020:2022-1","openSUSE-SU-2020:2133-1"],"analysis":{"component_type":"browser","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Mozilla Firefox","requires_auth":"none","summary":"A use-after-free vulnerability in Firefox allows attackers to execute arbitrary code via crafted web content.","user_interaction":"required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mozilla","cpe":[{"product":"firefox","vendor":"mozilla"},{"product":"firefox_esr","vendor":"mozilla"},{"product":"thunderbird","vendor":"mozilla"}],"cvss":{"score":8.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox \u003c 82.0.3, Firefox ESR \u003c 78.4.1, and Thunderbird \u003c 78.4.2.","ecosystems":["Red Hat:enterprise_linux:6::client","Red Hat:enterprise_linux:6::computenode","Red Hat:enterprise_linux:6::server","Red Hat:enterprise_linux:6::workstation","Red Hat:enterprise_linux:7::client","Red Hat:enterprise_linux:7::server","Red Hat:enterprise_linux:7::workstation","Red Hat:enterprise_linux:8::appstream","Red Hat:rhel_e4s:8.0::appstream","Red Hat:rhel_eus:8.1::appstream","Red Hat:rhel_eus:8.2::appstream","SUSE:Enterprise Storage 5","SUSE:HPE Helion OpenStack 8","SUSE:Linux Enterprise Module for Desktop Applications 15 SP1","SUSE:Linux Enterprise Module for Desktop Applications 15 SP2","SUSE:Linux Enterprise Server 11 SP4-LTSS","SUSE:Linux Enterprise Server 12 SP2-BCL","SUSE:Linux Enterprise Server 12 SP2-LTSS","SUSE:Linux Enterprise Server 12 SP3-BCL","SUSE:Linux Enterprise Server 12 SP3-LTSS","SUSE:Linux Enterprise Server 12 SP4-LTSS","SUSE:Linux Enterprise Server 12 SP5","SUSE:Linux Enterprise Server for SAP Applications 12 SP2","SUSE:Linux Enterprise Server for SAP Applications 12 SP3","SUSE:Linux Enterprise Server for SAP Applications 12 SP4","SUSE:Linux Enterprise Server for SAP Applications 12 SP5","SUSE:Linux Enterprise Software Development Kit 12 SP5","SUSE:Linux Enterprise Workstation Extension 15 SP1","SUSE:Linux Enterprise Workstation Extension 15 SP2","SUSE:OpenStack Cloud 7","SUSE:OpenStack Cloud 8","SUSE:OpenStack Cloud 9","SUSE:OpenStack Cloud Crowbar 8","SUSE:OpenStack Cloud Crowbar 9","openSUSE:Leap 15.1","openSUSE:Leap 15.2"],"exploits":{"exploitdb":0,"first_seen":"2020-11-18","github_poc":0,"max_poc_stars":null,"metasploit":1,"nuclei":0,"refs":[{"date":"2020-11-18","kind":"metasploit","ref":"exploit/multi/browser/firefox_jit_use_after_free","stars":null,"title":"Firefox MCallGetProperty Write Side Effects Use After Free Exploit"}],"tier":"weaponised"},"has_fix":true,"headline":"Use after free in Firefox","id":"CVE-2020-26950","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"mozilla:firefox","products":["mozilla:firefox","mozilla:firefox_esr","mozilla:thunderbird"],"type":"use_after_free","year":"2020"},"n_packages":77,"n_references":3,"next":{"headline":"Cross-site scripting in Firefox","id":"CVE-2020-26951"},"packages":[{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["0:78.4.1-1.el6_10"],"introduced":["0"],"last_affected":[],"package":"firefox","purl":"pkg:rpm/redhat/firefox","source":"RHSA-2020:5104"},{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["0:78.4.1-1.el6_10"],"introduced":["0"],"last_affected":[],"package":"firefox-debuginfo","purl":"pkg:rpm/redhat/firefox-debuginfo","source":"RHSA-2020:5104"},{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["0:78.4.3-1.el6_10"],"introduced":["0"],"last_affected":[],"package":"thunderbird","purl":"pkg:rpm/redhat/thunderbird","source":"RHSA-2020:5164"},{"ecosystem":"Red Hat:enterprise_linux:6::client","fixed":["0:78.4.3-1.el6_10"],"introduced":["0"],"last_affected":[],"package":"thunderbird-debuginfo","purl":"pkg:rpm/redhat/thunderbird-debuginfo","source":"RHSA-2020:5164"},{"ecosystem":"Red Hat:enterprise_linux:6::computenode","fixed":["0:78.4.1-1.el6_10"],"introduced":["0"],"last_affected":[],"package":"firefox","purl":"pkg:rpm/redhat/firefox","source":"RHSA-2020:5104"},{"ecosystem":"Red Hat:enterprise_linux:6::computenode","fixed":["0:78.4.1-1.el6_10"],"introduced":["0"],"last_affected":[],"package":"firefox-debuginfo","purl":"pkg:rpm/redhat/firefox-debuginfo","source":"RHSA-2020:5104"},{"ecosystem":"Red Hat:enterprise_linux:6::server","fixed":["0:78.4.1-1.el6_10"],"introduced":["0"],"last_affected":[],"package":"firefox","purl":"pkg:rpm/redhat/firefox","source":"RHSA-2020:5104"},{"ecosystem":"Red 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Hat:rhel_e4s:8.0::appstream","fixed":["0:78.4.3-1.el8_0"],"introduced":["0"],"last_affected":[],"package":"thunderbird","purl":"pkg:rpm/redhat/thunderbird","source":"RHSA-2020:5167"},{"ecosystem":"Red Hat:rhel_e4s:8.0::appstream","fixed":["0:78.4.3-1.el8_0"],"introduced":["0"],"last_affected":[],"package":"thunderbird-debuginfo","purl":"pkg:rpm/redhat/thunderbird-debuginfo","source":"RHSA-2020:5167"},{"ecosystem":"Red Hat:rhel_e4s:8.0::appstream","fixed":["0:78.4.3-1.el8_0"],"introduced":["0"],"last_affected":[],"package":"thunderbird-debugsource","purl":"pkg:rpm/redhat/thunderbird-debugsource","source":"RHSA-2020:5167"},{"ecosystem":"Red Hat:rhel_eus:8.1::appstream","fixed":["0:78.4.1-1.el8_1"],"introduced":["0"],"last_affected":[],"package":"firefox","purl":"pkg:rpm/redhat/firefox","source":"RHSA-2020:5135"},{"ecosystem":"Red Hat:rhel_eus:8.1::appstream","fixed":["0:78.4.1-1.el8_1"],"introduced":["0"],"last_affected":[],"package":"firefox-debuginfo","purl":"pkg:rpm/redhat/firefox-debuginfo","source":"RHSA-2020:5135"}],"prev":{"headline":"Server-side request forgery in n/a","id":"CVE-2020-26948"},"products":["Firefox","Firefox ESR","Thunderbird"],"published":"2020-12-09","related":[{"cvss_score":10,"headline":"Mozilla Firefox and Thunderbird Sandbox Escape","id":"CVE-2019-11708","kev_date_added":"2022-05-23","published":"2019-07-23"},{"cvss_score":9.8,"headline":"Mozilla Multiple Products Remote Code Execution","id":"CVE-2010-3765","kev_date_added":"2025-10-06","published":"2010-10-27"},{"cvss_score":9.6,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2022-26486","kev_date_added":"2022-03-07","published":"2022-12-22"},{"cvss_score":8.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2022-26485","kev_date_added":"2022-03-07","published":"2022-12-22"},{"cvss_score":8.8,"headline":"Mozilla Firefox and Thunderbird Type Confusion","id":"CVE-2019-11707","kev_date_added":"2022-05-23","published":"2019-07-23"},{"cvss_score":8.1,"headline":"Mozilla Firefox And Thunderbird Use-After-Free","id":"CVE-2020-6819","kev_date_added":"2021-11-03","published":"2020-04-24"},{"cvss_score":8.1,"headline":"Mozilla Firefox And Thunderbird Use-After-Free","id":"CVE-2020-6820","kev_date_added":"2021-11-03","published":"2020-04-24"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"BSD-3-Clause","name":"Metasploit"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["Mozilla"]},"summary":"A use-after-free vulnerability in Firefox allows attackers to execute arbitrary code via crafted web content.","url":"https://insights.sbomify.com/CVE-2020-26950/"}