HIGHCVSS v3.1 8.8Actively exploited · CISA KEV since 2021-11-03Vulnerability

CVE-2019-17026

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

Properties

Euvd product
Thunderbird, Firefox ESR, Firefox
Vulnerability name
Mozilla Firefox And Thunderbird Type Confusion Vulnerability
First seen
2025-10-21T23:35:50+00:00
Cvss score
8.8
Epss score
0.46311
Last seen
2026-10-19T12:00:27+00:00
Due date
2022-05-03
Euvd assigner
mozilla
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2021-11-03T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2021-11-03
Score
8.8
Euvd base score version
3.1
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Mozilla
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
8.8

Related Entities (7)

AFFECTS_PRODUCT (4)

→[Product]cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
→[Product]cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
→[Product]cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*

DESCRIBES (1)

←[KEVEntry]Mozilla Firefox And Thunderbird Type Confusion Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Access of Resource Using Incompatible Type ('Type Confusion')

INVOLVES (1)

←[Signal]kev_added · 2021-11-03

Explore deeper with Ninja Signal's threat intelligence graph

Search in SpektrOpen Signal Desktop
CVE-2019-17026 (CVSS v3.1 8.8) — Ninja Signal Threat Intelligence | Ninja Signal