What’s Vulnerable › Vulnerabilities

CVE-2018-5092

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-416

Description

A use-after-free vulnerability can occur when the thread for a Web Worker is freed from memory prematurely instead of from memory in the main thread while cancelling fetch operations. This vulnerability affects Firefox < 58.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10
• Mozilla Firefox: through 57.0.4

References

• http://www.securityfocus.com/bid/102786
• http://www.securitytracker.com/id/1040270
• https://bugzilla.mozilla.org/show_bug.cgi?id=1418074
• https://usn.ubuntu.com/3544-1/
• https://www.mozilla.org/security/advisories/mfsa2018-02/
• http://www.securityfocus.com/bid/102786
• http://www.securitytracker.com/id/1040270
• https://bugzilla.mozilla.org/show_bug.cgi?id=1418074
• https://usn.ubuntu.com/3544-1/
• https://www.mozilla.org/security/advisories/mfsa2018-02/

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