Description
Invalid pointer in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Published: 2026-02-24
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Arbitrary code execution
Action: Immediate Patch
AI Analysis

Impact

An invalid pointer in the JavaScript Engine component can lead to memory corruption, potentially allowing an attacker to execute arbitrary code or crash the application. The flaw is classified as CWE-824. Based on the description, the flaw appears to be exploitable by delivering malicious JavaScript or by prompting the engine to dereference a null or dangling pointer.

Affected Systems

The vulnerability affects Mozilla Firefox current releases prior to version 148 and Firefox Extended Support Release (ESR) prior to 140.8, as well as Thunderbird current releases prior to version 148 and Thunderbird ESR prior to 140.8. Any installation of these products on which the JavaScript engine is active is susceptible.

Risk and Exploitability

The CVSS score of 8.8 places this vulnerability in the high severity range, while the EPSS score of less than 1% indicates a very low current exploitation probability. It is not listed in the CISA Known Exploited Vulnerabilities catalog. The likely attack vector is local or remote delivery of malicious JavaScript content through web browsing or email, exploiting the pointer dereference in the engine.

Generated by OpenCVE AI on April 15, 2026 at 16:08 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade Mozilla Firefox to version 148 or later
  • Upgrade Mozilla Firefox ESR to version 140.8 or later
  • Upgrade Mozilla Thunderbird to version 148 or later
  • Upgrade Mozilla Thunderbird ESR to version 140.8 or later

Generated by OpenCVE AI on April 15, 2026 at 16:08 UTC.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4495-1 thunderbird security update
Debian DLA Debian DLA DLA-4496-1 firefox-esr security update
Debian DSA Debian DSA DSA-6148-1 firefox-esr security update
Debian DSA Debian DSA DSA-6152-1 thunderbird security update
History

Mon, 13 Apr 2026 14:30:00 +0000

Type Values Removed Values Added
Description Invalid pointer in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. Invalid pointer in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Fri, 06 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
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': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Wed, 25 Feb 2026 16:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-824
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:*:*:*
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

 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'}

Wed, 25 Feb 2026 12:00:00 +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, 25 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

threat_severity

Moderate

Tue, 24 Feb 2026 18:00:00 +0000

Type Values Removed Values Added
Description Invalid pointer in the JavaScript Engine component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. Invalid pointer in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
References

Tue, 24 Feb 2026 14:00:00 +0000

Type Values Removed Values Added
Description Invalid pointer in the JavaScript Engine component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8.
Title Invalid pointer in the JavaScript Engine component
References

Subscriptions

Mozilla Firefox Firefox Esr Thunderbird
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-04-13T13:53:37.061Z

Reserved: 2026-02-19T15:06:21.995Z

Link: CVE-2026-2785

cve-icon Vulnrichment

Updated: 2026-02-26T20:06:35.740Z

cve-icon NVD

Status : Modified

Published: 2026-02-24T14:16:26.950

Modified: 2026-04-13T15:17:26.507

Link: CVE-2026-2785

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-02-24T13:33:18Z

Links: CVE-2026-2785 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-15T17:15:10Z

Weaknesses