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VULNERABILITIES

CVE-2026-4729 Details

Description

Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Metrics

CVSS 3.x Severity and Vector Strings:

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

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://access.redhat.com/security/cve/CVE-2026-4729 redhat-SADP
https://bugzilla.redhat.com/show_bug.cgi?id=2450745 redhat-SADP
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4729.json redhat-SADP
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1944033%2C1997282%2C2009213%2C2011412%2C2021925%2C2022034 [email protected]Broken Link
https://www.mozilla.org/security/advisories/mfsa2026-20/ [email protected]Vendor Advisory

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')CISA-ADP
CWE-825Expired Pointer Dereferenceredhat-SADP

Affected Products

ProductVersions
mozilla firefox
< 149.0

CPE

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

Remediation

  • No remediation found in references.
mozilla thunderbird
< 149.0

CPE

  • 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-2026-4729
NVD Published Date:
Mar 24, 2026
NVD Last Modified:
Jul 15, 2026
Source:
[email protected]
CVE-2026-4729 Details - Not Deferred