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Vulnerability record · CVE-2016-5259 · published 5 August 2016

CVE-2016-5259: Mozilla firefox use after free vulnerability

Mozilla · Firefox

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackers to execute arbitrary code via a script that closes its own Service Worker within a nested sync event loop.

8.8 CVSS 3.0 High EPSS 3.3% · top 12.0% CWE-416 · Use after free
8.8CVSS 3.0 base score, v2 6.8
3.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
22References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackers to execute arbitrary code via a script that closes its own Service Worker within a nested sync event loop.

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00029.html
http://rhn.redhat.com/errata/RHSA-2016-1551.html
http://www.debian.org/security/2016/dsa-3640
http://www.mozilla.org/security/announce/2016/mfsa2016-73.html Vendor Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
http://www.securityfocus.com/bid/92258
http://www.securitytracker.com/id/1036508
http://www.ubuntu.com/usn/USN-3044-1
https://bugzilla.mozilla.org/show_bug.cgi?id=1282992 ExploitIssue Tracking
https://security.gentoo.org/glsa/201701-15
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00029.html
http://rhn.redhat.com/errata/RHSA-2016-1551.html
http://www.debian.org/security/2016/dsa-3640
http://www.mozilla.org/security/announce/2016/mfsa2016-73.html Vendor Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
http://www.securityfocus.com/bid/92258
http://www.securitytracker.com/id/1036508
http://www.ubuntu.com/usn/USN-3044-1
https://bugzilla.mozilla.org/show_bug.cgi?id=1282992 ExploitIssue Tracking
https://security.gentoo.org/glsa/201701-15

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-5259), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.