The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
History

Mon, 13 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
Description The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1. The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

Mon, 03 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Thu, 30 Oct 2025 16:15:00 +0000

Type Values Removed Values Added
Title firefox: thunderbird: Incorrect JavaScript state machine for generators Incorrect JavaScript state machine for generators

Tue, 29 Jul 2025 12:30:00 +0000

Type Values Removed Values Added
Title firefox: thunderbird: Incorrect JavaScript state machine for generators
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:10.0
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics threat_severity

None

threat_severity

Low


Mon, 28 Jul 2025 18:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*

Wed, 23 Jul 2025 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Mozilla firefox Esr
Mozilla thunderbird
Vendors & Products Mozilla
Mozilla firefox
Mozilla firefox Esr
Mozilla thunderbird

Wed, 23 Jul 2025 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476
Metrics cvssV3_1

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

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 22 Jul 2025 21:00:00 +0000

Type Values Removed Values Added
Description The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2025-07-22T20:49:27.477Z

Updated: 2026-04-13T14:27:06.664Z

Reserved: 2025-07-22T10:13:59.291Z

Link: CVE-2025-8033

cve-icon Vulnrichment

Updated: 2025-11-03T20:07:52.372Z

cve-icon NVD

Status : Modified

Published: 2025-07-22T21:15:50.457

Modified: 2026-04-13T15:17:09.897

Link: CVE-2025-8033

cve-icon Redhat

Severity : Low

Publid Date: 2025-07-22T20:49:27Z

Links: CVE-2025-8033 - Bugzilla