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9.8 Critical

CVE-2026-74988 Internally found bugs present in Firefox ESR 153.0 and Firefox 153

Description

Internally found bugs present in Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Affected products and versions

Product Affected versions Fixed in
Firefox 154 earliest → < 154 154
Firefox 153.1 earliest → < 153.1 153.1
Thunderbird 154 earliest → < 154 154
Thunderbird 153.1 earliest → < 153.1 153.1

References

Timeline

  1. Published
  2. Last modified

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