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CVE-2020-15656 JIT optimizations involving the Javascript arguments object could confuse later optimizations

Description

JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

Affected products and versions

Product Affected versions Fixed in
Firefox ESR 78.1 earliest → < 78.1 78.1
Firefox 79 earliest → < 79 79
Thunderbird 78.1 earliest → < 78.1 78.1
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