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When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability affects Firefox < 140.
Reserved 2025-06-20 | Published 2025-06-24 | Updated 2025-06-24 | Assigner mozillaDNS Requests leaked outside of a configured SOCKS proxy
Albert
bugzilla.mozilla.org/show_bug.cgi?id=1943804
www.mozilla.org/security/advisories/mfsa2025-51/
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