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VULNERABILITIES

CVE-2026-5735 Details

Description

Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. 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 149.0.2 and Thunderbird 149.0.2.

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/security/cve/CVE-2026-5735 redhat-SADP
https://bugzilla.redhat.com/show_bug.cgi?id=2455904 redhat-SADP
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5735.json redhat-SADP
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025475%2C2025477 [email protected]Broken LinkIssue Tracking
https://www.mozilla.org/security/advisories/mfsa2026-25/ [email protected]Vendor Advisory

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-787Out-of-bounds Write[email protected]
CWE-125Out-of-bounds ReadCISA-ADP
CWE-787Out-of-bounds Writeredhat-SADP
CWE-787Out-of-bounds WriteCISA-ADP

Affected Products

ProductVersions
mozilla firefox
< 149.0.2

CPE

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

Remediation

  • No remediation found in references.
mozilla thunderbird
< 149.0.2

CPE

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

Remediation

  • No remediation found in references.

Change History

10 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-5735
NVD Published Date:
Apr 7, 2026
NVD Last Modified:
Jul 15, 2026
Source:
[email protected]
CVE-2026-5735 Details - Not Deferred