CVE-2019-9789

critical

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

9.5

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 65. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 66.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2019-9789

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201903-11

OS impact

OS	Version	Status	Fixed in
arch		fixed	`66.0-1`
debian	sid	fixed	`66.0-1`

References

https://security.archlinux.org/ASA-201903-11
https://security-tracker.debian.org/tracker/CVE-2019-9789

Verify integrity in audit chain (admin only). AS-IS.