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8.8 High

CVE-2025-4919 An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes

Description

An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

Affected products and versions

Product Affected versions Fixed in
Firefox 138.0 earliest → < 138.0.4 138.0.4
Firefox 128.10 earliest → < 128.10.1 128.10.1
Firefox 115.23 earliest → < 115.23.1 115.23.1
Firefox ESR 115.23 earliest → < 115.23.1 115.23.1
Thunderbird 138.0 earliest → < 138.0.2 138.0.2
Thunderbird 128.10 earliest → < 128.10.2 128.10.2

References

Timeline

  1. Published
  2. Last modified

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