CVE-2026-6759
published 2026-04-21CVE-2026-6759: Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
PriorityP341high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.36%
28.6th percentile
Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 150 | Firefox 150 |
| mozilla | firefox | < 140.10.0 | 140.10.0 |
| mozilla | firefox | < 150.0 | 150.0 |
| mozilla | firefox_esr | < Firefox ESR 140.10 | Firefox ESR 140.10 |
| mozilla | thunderbird | < Thunderbird 150 | Thunderbird 150 |
| mozilla | thunderbird | < Thunderbird 140.10 | Thunderbird 140.10 |
| mozilla | thunderbird | >= 140.0 < 140.10.0 | 140.10.0 |
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: Use-after-free in the Widget: Cocoa component
vendor_redhat·2026-04-21·CVSS 7.5
CVE-2026-6759 [HIGH] CWE-825 firefox: Use-after-free in the Widget: Cocoa component
firefox: Use-after-free in the Widget: Cocoa component
Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Use-after-free in the Widget: Cocoa component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Mozilla
Mozilla Foundation Security Advisory 2026-32: CVE-2026-6759
vendor_mozilla·CVSS 7.5
CVE-2026-6759 [HIGH] Mozilla Foundation Security Advisory 2026-32: CVE-2026-6759
Mozilla Foundation Security Advisory 2026-32
CVE: CVE-2026-6759
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6759
vendor_mozilla·CVSS 7.5
CVE-2026-6759 [HIGH] Mozilla Foundation Security Advisory 2026-30: CVE-2026-6759
Mozilla Foundation Security Advisory 2026-30
CVE: CVE-2026-6759
Product: Firefox
Impact: high
Fixed in: Firefox 150
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6759
vendor_mozilla·CVSS 7.5
CVE-2026-6759 [HIGH] Mozilla Foundation Security Advisory 2026-33: CVE-2026-6759
Mozilla Foundation Security Advisory 2026-33
CVE: CVE-2026-6759
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 150
Mozilla
Mozilla Foundation Security Advisory 2026-34: CVE-2026-6759
vendor_mozilla·CVSS 7.5
CVE-2026-6759 [HIGH] Mozilla Foundation Security Advisory 2026-34: CVE-2026-6759
Mozilla Foundation Security Advisory 2026-34
CVE: CVE-2026-6759
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.10
Citrix
Citrix Security Bulletin CTX694820
vendor_citrix·CVSS 5.9
CVE-2025-12101 [MEDIUM] Citrix Security Bulletin CTX694820
Citrix Security Bulletin CTX694820
CVE References: CVE-2025-12101, CVE-2025-62626, CVE-2025-6759, CVE-2026-23554, CVE-2026-3055, CVE-2026-4368, CVE-2026-4397
Affected Products: Citrix ADM, Citrix Hypervisor, Citrix Virtual Apps and Desktops, Endpoint Management, NetScaler ADC, NetScaler Gateway, XenServer
GHSA
GHSA-w4vh-g4vq-3rf9: Use-after-free in the Widget: Cocoa component
ghsa_unreviewed·2026-04-21
CVE-2026-6759 [HIGH] CWE-416 GHSA-w4vh-g4vq-3rf9: Use-after-free in the Widget: Cocoa component
Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.
No detection rules found.
No public exploits indexed.
2026-04-21
Published