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VULNERABILITIES

CVE-2026-2763 Details

Description

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA: redhat-SADPCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:3338 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:3339 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:3361 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:3491 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:3492 redhat-SADP

see all 34 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-416Use After Free[email protected]
CWE-416Use After FreeCISA-ADP

Affected Products

ProductVersions
mozilla firefox
< 115.33.0
< 148.0
>= 128.0, < 140.8.0

CPE

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.
mozilla thunderbird
< 140.8.0
< 148.0

CPE

  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.

Change History

9 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-2763
NVD Published Date:
Feb 24, 2026
NVD Last Modified:
Jul 15, 2026
Source:
[email protected]
CVE-2026-2763 Details - Not Deferred