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7.3 High

CVE-2025-10528 Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component

Description

Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

Affected products and versions

Product Affected versions Fixed in
Firefox 143 earliest → < 143 143
Firefox 140.3 earliest → < 140.3 140.3
Firefox ESR 140.3 earliest → < 140.3 140.3
Thunderbird 143 earliest → < 143 143
Thunderbird 140.3 earliest → < 140.3 140.3

References

Timeline

  1. Published
  2. Last modified

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The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High
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