CVE-2026-109776 | BDVDB-2026-388646 Detail

MozillaFirefox

Description#

Race condition in the XPCOM component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact none. Attack vector: network.

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

No public exploit known

4.2 Medium

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 3.8.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Race Condition

No specific action is recorded in the source data. Check the references for vendor guidance.

Not available

4.2 Medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).