CVE-2019-9791

CRITICAL 9.8CVE-2019-9791 · Published 26/04/2019 · updated 17/06/2026

Package	Affected versions	Patched versions
firefox mozilla	`< 60.6.0< 66.0`	`60.6.066.0`
thunderbird mozilla	`< 60.6.0`	`60.6.0`

Description

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

References

access.redhat.com/errata/RHSA-2019:0966 · Third Party Advisory
access.redhat.com/errata/RHSA-2019:1144 · Third Party Advisory
bugzilla.mozilla.org/show_bug.cgi · Exploit
mozilla.org/security/advisories/mfsa2019-07 · Vendor Advisory
mozilla.org/security/advisories/mfsa2019-08 · Vendor Advisory
mozilla.org/security/advisories/mfsa2019-11 · Vendor Advisory

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