FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

Mozilla -- Memory safety bugs

Affected packages
	firefox	<	149.0.2,2
	firefox-esr	<	140.9.1
	thunderbird	<	149.0.2
	thunderbird-esr	<	140.9.1

Details

VuXML ID	6ae8f9e5-3a26-11f1-b60b-b42e991fc52e
Discovery	2026-04-07
Entry	2026-04-17

Mozilla reports:

Memory safety bugs present in Firefox ESR, Firefox ESR , Thunderbird ESR, and Thunderbird. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

[source]

References

CVE Name	CVE-2026-5731
URL	https://cveawg.mitre.org/api/cve/CVE-2026-5731