CISA KEV

CVE-2019-17026

Mozilla Firefox And Thunderbird Type Confusion Vulnerability

Mozilla Firefox and Thunderbird contain a type confusion vulnerability due to incorrect alias information in the IonMonkey JIT compiler when setting array elements.

VendorMozilla

ProductFirefox and Thunderbird

EPSS46.6%

Added to KEVNov 03, 2021

Remediation DueMay 03, 2022

Known Ransomware UseUnknown

CWECWE-843

Required Action

Apply updates per vendor instructions.

From Disclosure to Action

Know how quickly you need to move.

For CVE-2019-17026, added to the catalogue on Nov 03, 2021 with a remediation deadline of May 03, 2022.

Added to KEVNov 03, 2021

Seraph AlertSame day

Remediation DueMay 03, 2022

ValidationOngoing

Overdue1639 days overdue

Recommended action: Apply vendor remediation guidance.

Seraph Context

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References

https://nvd.nist.gov/vuln/detail/CVE-2019-17026

More from Mozilla in the KEV catalogue.

CVE-2010-3765Multiple ProductsAdded Oct 06, 2025 CVE-2024-9680FirefoxAdded Oct 15, 2024 CVE-2016-9079Firefox, Firefox ESR, and ThunderbirdAdded Jun 22, 2023

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