CVE-2019-9792

CRITICAL 9.8CVE-2019-9792 · 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 IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

References

packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html · Exploit
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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