On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. 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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Mozilla
  • Firefox
  • Firefox Esr
  • Thunderbird
Redhat
  • Enterprise Linux

Configuration 1 [-]

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
Package CPE Advisory Released Date
Red Hat Enterprise Linux 10
firefox-0:128.13.0-1.el10_0 cpe:/o:redhat:enterprise_linux:10.0 RHSA-2025:11797 2025-07-28T00:00:00Z
Red Hat Enterprise Linux 8
firefox-0:128.13.0-1.el8_10 cpe:/a:redhat:enterprise_linux:8 RHSA-2025:11747 2025-07-24T00:00:00Z
Red Hat Enterprise Linux 9
firefox-0:128.13.0-1.el9_6 cpe:/a:redhat:enterprise_linux:9 RHSA-2025:11748 2025-07-24T00:00:00Z
References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=1968423 cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-8027 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-8027 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-56/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-57/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-58/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-58/#CVE-2025-8027 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-59/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-61/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-62/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-62/#CVE-2025-8027 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-63/ cve-icon cve-icon
History

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

Type Values Removed Values Added
Description On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. 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. On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. 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: JavaScript engine only wrote partial return value to stack JavaScript engine only wrote partial return value to stack

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

Type Values Removed Values Added
Title firefox: thunderbird: JavaScript engine only wrote partial return value to stack
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

Important

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-457
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 On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. 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: 2025-07-22T20:49:24.039Z

Updated: 2026-04-13T14:26:46.624Z

Reserved: 2025-07-22T10:13:47.266Z

Link: CVE-2025-8027

cve-icon Vulnrichment

Updated: 2025-11-03T20:07:44.121Z

cve-icon NVD

Status : Modified

Published: 2025-07-22T21:15:49.830

Modified: 2026-04-13T15:17:08.497

Link: CVE-2025-8027

cve-icon Redhat

Severity : Important

Publid Date: 2025-07-22T20:49:24Z

Links: CVE-2025-8027 - Bugzilla