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CVE-2019-17026 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CNA: CISA-ADPCVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/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.

URL	Source(s)	Tag(s)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17026	CISA-ADP	US Government Resource
http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html	CVE	ExploitThird Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1607443	CVE	Issue Tracking
https://security.gentoo.org/glsa/202003-02	CVE	Third Party Advisory
https://usn.ubuntu.com/4335-1/	CVE	Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-03/	CVE	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-04/	CVE	Vendor Advisory
http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html	[email protected]	ExploitThird Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1607443	[email protected]	Issue Tracking
https://security.gentoo.org/glsa/202003-02	[email protected]	Third Party Advisory
https://usn.ubuntu.com/4335-1/	[email protected]	Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-03/	[email protected]	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-04/	[email protected]	Vendor Advisory

see all 13 references

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name	Date Added	Due Date	Required Action
Mozilla Firefox And Thunderbird Type Confusion Vulnerability	Nov 3, 2021	May 3, 2022	Apply updates per vendor instructions.

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-843	Access of Resource Using Incompatible Type ('Type Confusion')	[email protected]
CWE-843	Access of Resource Using Incompatible Type ('Type Confusion')	CISA-ADP

Affected Products

Product	Versions
mozilla firefox	< 68.4.1 < 72.0.1
CPE cpe:2.3:a:mozilla:firefox:::::esr:::* cpe:2.3:a:mozilla:firefox:::::-:::* Remediation No remediation found in references.
mozilla thunderbird	< 68.4.1
CPE cpe:2.3:a:mozilla:thunderbird:::::::: Remediation No remediation found in references.
canonical ubuntu linux	16.04
CPE cpe:2.3:o:canonical:ubuntu_linux:16.04::::esm::: Remediation No remediation found in references.

Change History

15 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 4, 2025	Modified Analysis	[email protected]
Oct 22, 2025	CVE Modified	CISA-ADP
Oct 21, 2025	CVE Modified	CISA-ADP
Oct 21, 2025	CVE Modified	CISA-ADP
Mar 21, 2025	Modified Analysis	[email protected]
Feb 7, 2025	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Nov 16, 2022	Modified Analysis	[email protected]
May 13, 2021	CVE Modified	[email protected]
Apr 29, 2020	CVE Modified	[email protected]
Mar 12, 2020	CVE Modified	[email protected]
Mar 4, 2020	Initial Analysis	[email protected]

CVE-2019-17026 Details

Description

Metrics

References to Advisories, Solutions, and Tools

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Weakness Enumeration

Affected Products

CPE

Remediation

CPE

Remediation

CPE

Remediation

Change History

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