CVE-2026-8388

Incorrect boundary conditions in the JavaScript Engine: JIT component

Published May 12, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4592-1 firefox-esr security update
Debian DLA Debian DLA DLA-4594-1 thunderbird security update
Debian DSA Debian DSA DSA-6283-1 firefox-esr security update
Debian DSA Debian DSA DSA-6288-1 thunderbird security update
References
Link Providers
https://access.redhat.com/errata/RHSA-2026:21378 cve-icon
https://access.redhat.com/errata/RHSA-2026:21380 cve-icon
https://access.redhat.com/errata/RHSA-2026:21381 cve-icon
https://access.redhat.com/errata/RHSA-2026:21382 cve-icon
https://access.redhat.com/errata/RHSA-2026:22325 cve-icon
https://access.redhat.com/errata/RHSA-2026:22643 cve-icon
https://access.redhat.com/errata/RHSA-2026:26174 cve-icon
https://access.redhat.com/errata/RHSA-2026:26268 cve-icon
https://access.redhat.com/errata/RHSA-2026:26269 cve-icon
https://access.redhat.com/errata/RHSA-2026:26270 cve-icon
https://access.redhat.com/errata/RHSA-2026:26491 cve-icon
https://access.redhat.com/errata/RHSA-2026:26492 cve-icon
https://access.redhat.com/errata/RHSA-2026:26493 cve-icon
https://access.redhat.com/errata/RHSA-2026:26521 cve-icon
https://access.redhat.com/errata/RHSA-2026:26536 cve-icon
https://access.redhat.com/errata/RHSA-2026:26539 cve-icon
https://access.redhat.com/errata/RHSA-2026:26551 cve-icon
https://access.redhat.com/errata/RHSA-2026:26606 cve-icon
https://access.redhat.com/errata/RHSA-2026:26629 cve-icon
https://access.redhat.com/errata/RHSA-2026:26630 cve-icon
https://access.redhat.com/errata/RHSA-2026:27715 cve-icon
https://access.redhat.com/security/cve/CVE-2026-8388 cve-icon
https://bugzilla.mozilla.org/show_bug.cgi?id=2036978 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2476469 cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-8388 cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8388.json cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-8388 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-45/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-45/#CVE-2026-8388 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-47/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-48/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-48/#CVE-2026-8388 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-51/ cve-icon cve-icon
History
Type Values Removed Values Added
Description Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11. Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
References
Type Values Removed Values Added
Weaknesses CWE-787
Type Values Removed Values Added
Description Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3. Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11.
References
Type Values Removed Values Added
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-119
CWE-787
Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox
Type Values Removed Values Added
Description Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
Title Incorrect boundary conditions in the JavaScript Engine: JIT component
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Jul 15, 2026, 2:48 AM
Reserved
May 12, 2026, 12:36 PM
Status
Modified
Published
May 12, 2026, 2:17 PM
Modified
Oct 26, 2026, 6:10 PM
Severity
Important
Public date
May 12, 2026, 12:36 PM