Out-of-Bounds Affecting firefox package, versions <155.0-1


Severity

Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
0.3% (23rd percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-FIREFOX-19477589
  • published2 Sept 2026
  • disclosed1 Sept 2026

Introduced: 1 Sep 2026

NewCVE-2026-84142  (opens in a new tab)
CWE-119  (opens in a new tab)

How to fix?

Upgrade Debian:unstable firefox to version 155.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

Internally found bugs present in Thunderbird 154. 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 155 and Thunderbird 155.

CVSS Base Scores

version 3.1