Mozilla patches zero-day flaw in Firefox

Mozilla the makers of Firefox has issued a zero-day security update for Firefox and Firefox Extended Support Release, which were found to contain an actively exploited flaw in the IonMonkey JIT compiler.

What is known

“Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion,” they stated in the official advisory posted by Mozilla, citing the two elements as StoreElementHole and FallibleStoreElmenet. “We are aware of targeted attacks in the wild abusing this flaw.”

Announced January 8, 2020
Impact: critical
Products: Firefox, Firefox ESRFixed in

  • Firefox 72.0.1
  • Firefox ESR 68.4.1


Designated CVE-2019-17026, the zero-day bug was reported by researchers at Qihoo 360 ATA. The problem has been fixed with the latest release of Firefox 72.0.1 and Firefox ESR 68.4.1

No other details have been provided by firefox. Click here to Download Latest Firefox Software to patch the zero-day flaw.

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