CVE-2026-109708

Publication date 13 October 2026

Last updated 28 October 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.6 · Critical

Score breakdown

Description

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

Read the notes from the security team

Status

Package Ubuntu Release Status
firefox 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
thunderbird 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Vulnerable
mozjs38 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
18.04 LTS bionic
Needs evaluation
mozjs52 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored
18.04 LTS bionic Ignored
mozjs68 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored
mozjs78 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored
mozjs91 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored
mozjs102 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Ignored
22.04 LTS jammy Ignored
mozjs115 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Ignored
22.04 LTS jammy Not in release

Notes

mdeslaur

mozjs* contain a copy of the SpiderMonkey JavaScript engine. It is not feasible to backport security fixes to the mozjs* packages, as such, marking them as ignored. starting with Ubuntu 22.04, the firefox package is just a script that installs the Firefox snap starting with Ubuntu 24.04, the thunderbird package is just a script that installs the Thunderbird snap

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.6 · Critical

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

Other references

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