Is CVE-2019-17026 actively exploited?

CVE-2019-17026 has no public evidence of in-the-wild exploitation as of 2025-11-04.

What is the CVSS score for CVE-2019-17026?

CVE-2019-17026 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

How do I patch CVE-2019-17026?

Patch guidance is available from mozilla security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2019-17026.

Fix CVE-2019-17026 - HIGH mozilla firefox

Q: Which products are affected by CVE-2019-17026?

4 products: mozilla firefox, mozilla firefox, mozilla thunderbird, canonical ubuntu linux.

Description

Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-843 CWE-843

Metadata

Primary Vendor: MOZILLA
Published: 3/2/2020
Last Modified: 11/4/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2019-17026

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary