CVE-2026-4689 (GCVE-0-2026-4689)

Vulnerability from cvelistv5 – Published: 2026-03-24 12:30 – Updated: 2026-03-25 14:05
VLAI?
Title
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component
Summary
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
Severity ?
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  • CWE-190 - Integer Overflow or Wraparound
Assigner
References
Impacted products
Vendor Product Version
Mozilla Firefox Affected: unspecified , < 149 (custom)
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    Mozilla Firefox ESR Affected: unspecified , < 115.34 (custom)
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    Mozilla Firefox ESR Affected: unspecified , < 140.9 (custom)
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    Mozilla Thunderbird Affected: unspecified , < 149 (custom)
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    Mozilla Thunderbird Affected: unspecified , < 140.9 (custom)
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Credits
Sajeeb Lohani
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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.