CVE-2026-4729

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{"bugzilla": {"description": "firefox: Memory safety bugs fixed in Firefox 149 and Thunderbird 149", "id": "2450745", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450745"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:\nMemory safety bugs present in Firefox 148 and Thunderbird 148. 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."], "name": "CVE-2026-4729", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-24T12:30:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4729\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4729\nhttps://www.mozilla.org/security/advisories/mfsa2026-20/#CVE-2026-4729"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,149)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-13T16:37:17.645186+00:00", "value": {"mitigation_remediation": ["Update Mozilla Firefox to version 149 or later, ensuring the latest build is installed.", "Update Mozilla Thunderbird to version 149 or later.", "Verify that the updated software is running and that no older versions remain on the system.", "If an immediate upgrade is not feasible, restrict the use of the affected applications until a patch is applied, and monitor for related security advisories."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The flaws affect Mozilla Firefox 148 and Mozilla Thunderbird 148. They were addressed in the subsequent major release, Firefox 149 and Thunderbird 149, so any systems running the 148 releases or earlier remain vulnerable.", "description_and_impact": "Memory safety bugs were identified in Firefox 148 and Thunderbird 148 that can lead to memory corruption. The vendor\u2019s analysis suggests that with sufficient effort, these bugs could be exploited to execute arbitrary code. The weaknesses involve improper handling of memory buffers (CWE\u2011120) and related buffer size mismatches (CWE\u2011825). If successfully leveraged, an attacker could gain complete control over a victim\u2019s machine via the compromised browser or email client.", "risk_and_exploitability": "The CVSS score of 9.8 reflects a severe threat with full availability, confidentiality, and integrity impact. The EPSS score is below 1\u202f%, indicating a low likelihood of exploitation at present, and the vulnerability is not listed in CISA\u2019s KEV catalog. The likely attack vector is through malicious web content or email messages that contain specially crafted input to trigger the memory corruption. No publicly available exploit exists, so risk remains largely theoretical until an attacker produces a viable exploit."}}}}, "created": "2026-03-25T11:47:43.193855+00:00", "updated": "2026-04-14T16:42:45.076705+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"]}