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When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
41.0.2+build2-0ubuntu142.0+build2-0ubuntu144.0+build3-0ubuntu244.0.1+build1-0ubuntu144.0.2+build1-0ubuntu145.0+build2-0ubuntu145.0.1+build1-0ubuntu145.0.2+build1-0ubuntu146.0+build5-0ubuntu0.16.04.246.0.1+build1-0ubuntu0.16.04.2+63 more70.0+build2-0ubuntu0.16.04.156.0+build6-0ubuntu157.0.1+build2-0ubuntu159.0.1+build1-0ubuntu159.0.2+build1-0ubuntu160.0+build2-0ubuntu160.0.1+build2-0ubuntu0.18.04.160.0.2+build1-0ubuntu0.18.04.161.0+build3-0ubuntu0.18.04.161.0.1+build1-0ubuntu0.18.04.162.0+build2-0ubuntu0.18.04.3+25 more70.0+build2-0ubuntu0.18.04.169.0.3+build1-0ubuntu170.0+build2-0ubuntu138.8.0~repack1-0ubuntu138.8.0~repack1-0ubuntu338.8.0~repack1-0ubuntu452.3.1-0ubuntu352.3.1-7fakesync152.8.1-0ubuntu0.18.04.152.9.1-0ubuntu0.18.04.152.9.1-1build152.9.1-1ubuntu31:38.3.0+build1-0ubuntu21:38.5.1+build2-0ubuntu11:38.6.0+build1-0ubuntu11:38.7.2+build1-0ubuntu0.16.04.11:38.8.0+build1-0ubuntu0.16.04.11:45.2.0+build1-0ubuntu0.16.04.11:45.3.0+build1-0ubuntu0.16.04.21:45.4.0+build1-0ubuntu0.16.04.11:45.5.1+build1-0ubuntu0.16.04.11:45.7.0+build1-0ubuntu0.16.04.1+20 more1:68.7.0+build1-0ubuntu0.16.04.21:52.4.0+build1-0ubuntu21:52.6.0+build1-0ubuntu11:52.7.0+build1-0ubuntu11:52.8.0+build1-0ubuntu0.18.04.11:52.9.1+build3-0ubuntu0.18.04.11:60.2.1+build1-0ubuntu0.18.04.21:60.4.0+build2-0ubuntu0.18.04.11:60.5.1+build2-0ubuntu0.18.04.11:60.6.1+build2-0ubuntu0.18.04.11:60.7.0+build1-0ubuntu0.18.04.1+4 more1:68.2.1+build1-0ubuntu0.18.04.1Exploitability
AV:NAC:LPR:NUI:RScope
S:UImpact
C:HI:HA:HCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H