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{"analysis": {"en": {"generated_at": "2026-04-20T19:11:12.293555+00:00", "value": {"mitigation_remediation": ["Update Mozilla Firefox to version\u202f144 or later", "Update Mozilla Thunderbird to version\u202f144 or later", "Remove or disable any untrusted web extensions that use native messaging"], "summary": {"action": "Immediate Patch", "impact": "Denial of Service via application crash"}, "threat_synthesis": {"affected_systems": "Mozilla Thunderbird versions beginning with 143 on Windows are affected until the bug is fixed in version\u00a0144. Mozilla Firefox was patched in version\u00a0144, indicating that earlier releases may also be vulnerable, but the provided description does not identify specific Firefox versions that are impacted.", "description_and_impact": "The vulnerability is a use\u2011after\u2011free condition in the native messaging web\u2011extension API that can lead to crashes on Windows. The memory corruption can cause Mozilla Thunderbird or Firefox to terminate unexpectedly, resulting in a denial\u2011of\u2011service situation. The description does not indicate that the flaw can be used to achieve code execution or data exfiltration; it only mentions crashes.", "risk_and_exploitability": "The CVSS score of 9.8 indicates a high\u2011severity flaw. The EPSS score is reported as less than 1\u202f%, meaning the likelihood of exploitation is very low under current conditions. Because the CVE is not listed in the CISA KEV catalog, there is no known widespread exploitation in the wild. The likely attack vector would involve a malicious web extension running on a Windows machine; however, exploitation would still depend on the extension having native messaging privileges and would only lead to crashes rather than more severe compromise."}}}}, "created": "2025-10-20T15:49:34.783662+00:00", "updated": "2026-04-20T19:15:15.049905+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$windows", "mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$thunderbird"]}