Out-of-bounds Write Affecting thunderbird package, versions <1:60.6.1-1


Severity

Recommended
0.0
critical
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
13.2% (96th percentile)

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  • Snyk IDSNYK-ECHOLATEST-THUNDERBIRD-18318652
  • published26 Jul 2026
  • disclosed26 Apr 2019

Introduced: 26 Apr 2019

CVE-2019-9792  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Echo:latest thunderbird to version 1:60.6.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1