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Use After Free Affecting firefox-esr package, versions <52.3.0esr-1

Severity

 Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
2.71% (85th percentile)

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  • Snyk IDSNYK-ECHOLATEST-FIREFOXESR-18168729
  • published22 Jul 2026
  • disclosed11 Jun 2018
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Introduced: 11 Jun 2018

CVE-2017-7802  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Echo:latest firefox-esr to version 52.3.0esr-1 or higher.

NVD Description

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

A use-after-free vulnerability can occur when manipulating the DOM during the resize event of an image element. If these elements have been freed due to a lack of strong references, a potentially exploitable crash may occur when the freed elements are accessed. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.