CVE-2026-74982
published 2026-08-18CVE-2026-74982: Denial-of-service in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
PriorityP339high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.31%
23.8th percentile
Denial-of-service in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 153.1.0 | 153.1.0 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < 153.1.0 | 153.1.0 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Denial-of-service in the Widget component
vendor_redhat·2026-08-18·CVSS 7.5
CVE-2026-74982 [HIGH] CWE-770 firefox: thunderbird: Denial-of-service in the Widget component
firefox: thunderbird: Denial-of-service in the Widget component
Denial-of-service in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Denial-of-service in the Widget component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Not affected
Package
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74982
vendor_mozilla
CVE-2026-74982 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74982
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74982
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74982
vendor_mozilla
CVE-2026-74982 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74982
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74982
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74982
vendor_mozilla
CVE-2026-74982 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74982
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74982
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74982
vendor_mozilla
CVE-2026-74982 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74982
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74982
Product: Firefox
Impact: high
Fixed in: Firefox 154
GHSA
Denial-of-service in the Widget component.
ghsa_unreviewed·2026-08-18
CVE-2026-74982 Denial-of-service in the Widget component.
Denial-of-service in the Widget component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
No detection rules found.
No public exploits indexed.
2026-08-18
Published