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Vulnerability record · CVE-2018-12387 · published 18 October 2018

CVE-2018-12387: Redhat enterprise linux desktop improper input validation vulnerability

Redhat · Enterprise Linux Desktop

A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

9.1 CVSS 3.0 Critical EPSS 9.6% · top 4.7% CWE-20 · Improper input validation
9.1CVSS 3.0 base score, v2 6.4
9.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
18References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

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

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/105460 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041770 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:2881 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2884 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1493903 ExploitIssue TrackingPatchVendor Advisory
https://security.gentoo.org/glsa/201810-01 Third Party Advisory
https://usn.ubuntu.com/3778-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4310 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-24/ Vendor Advisory
http://www.securityfocus.com/bid/105460 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041770 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:2881 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2884 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1493903 ExploitIssue TrackingPatchVendor Advisory
https://security.gentoo.org/glsa/201810-01 Third Party Advisory
https://usn.ubuntu.com/3778-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4310 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-24/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-12387), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.