A race during concurrent delazification could have led to a use-after-free. This vulnerability affects Firefox < 135, Firefox ESR < 115.20, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135.

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Vendors Products
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Firefox Subscribe
Thunderbird Subscribe
Enterprise Linux Subscribe
Rhel Aus Subscribe
Rhel E4s Subscribe
Rhel Els Subscribe
Rhel Eus Subscribe
Rhel Tus Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4044-1 firefox-esr security update
Debian DLA Debian DLA DLA-4045-1 thunderbird security update
Debian DSA Debian DSA DSA-5858-1 firefox-esr security update
Debian DSA Debian DSA DSA-5860-1 thunderbird security update
EUVD EUVD EUVD-2025-1967 A race during concurrent delazification could have led to a use-after-free. This vulnerability affects Firefox < 135, Firefox ESR < 115.20, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135.
Ubuntu USN Ubuntu USN USN-7263-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-7663-1 Thunderbird vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 03 Nov 2025 21:30:00 +0000


Tue, 15 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00124}

epss

{'score': 0.00176}


Thu, 13 Feb 2025 01:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:8

Fri, 07 Feb 2025 14:30:00 +0000

Type Values Removed Values Added
Title firefox: thunderbird: Use-after-free during concurrent delazification
First Time appeared Redhat
Redhat enterprise Linux
Redhat rhel Aus
Redhat rhel E4s
Redhat rhel Els
Redhat rhel Eus
Redhat rhel Tus
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:rhel_aus:8.2
cpe:/a:redhat:rhel_aus:8.4
cpe:/a:redhat:rhel_aus:8.6
cpe:/a:redhat:rhel_e4s:8.4
cpe:/a:redhat:rhel_e4s:8.6
cpe:/a:redhat:rhel_e4s:9.0
cpe:/a:redhat:rhel_eus:8.8
cpe:/a:redhat:rhel_eus:9.2
cpe:/a:redhat:rhel_eus:9.4
cpe:/a:redhat:rhel_tus:8.4
cpe:/a:redhat:rhel_tus:8.6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat enterprise Linux
Redhat rhel Aus
Redhat rhel E4s
Redhat rhel Els
Redhat rhel Eus
Redhat rhel Tus
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 06 Feb 2025 20:00:00 +0000

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

Wed, 05 Feb 2025 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

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


Tue, 04 Feb 2025 14:15:00 +0000

Type Values Removed Values Added
Description A race during concurrent delazification could have led to a use-after-free. This vulnerability affects Firefox < 135, Firefox ESR < 115.20, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135.
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2025-11-03T20:56:54.541Z

Reserved: 2025-02-04T07:26:31.830Z

Link: CVE-2025-1012

cve-icon Vulnrichment

Updated: 2025-11-03T20:56:54.541Z

cve-icon NVD

Status : Modified

Published: 2025-02-04T14:15:32.000

Modified: 2025-11-03T21:18:51.117

Link: CVE-2025-1012

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-02-04T13:58:53Z

Links: CVE-2025-1012 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses