CVE-2019-9805

CRITICAL 9.8CVE-2019-9805 · Published 26/04/2019 · updated 17/06/2026

In short

CVE-2019-9805 is a CRITICAL (CVSS 9.8) vulnerability affecting firefox (mozilla).
Chance of exploitation in the next 30 days (EPSS): 1.4%, higher than 71.8% of all vulnerabilities.
Fix: update to 66.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 66.0`	`66.0`

Description

A latent vulnerability exists in the Prio library where data may be read from uninitialized memory for some functions, leading to potential memory corruption. This vulnerability affects Firefox < 66.

References

bugzilla.mozilla.org/show_bug.cgi · Issue Tracking
mozilla.org/security/advisories/mfsa2019-07 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 66.0

66.0

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