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Use of Uninitialized Variable

CVE-2025-8027

Medium
6.5/10

Summary

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • REQUIRED
  • NONE
  • HIGH
  • NONE

CWE-457 - Use of Uninitialized Variable

The code uses a variable that has not been initialized, leading to unpredictable or unintended results.

References

Advisory Timeline

  • Published