CVE-2026-6757
published 2026-04-21CVE-2026-6757: Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird…
PriorityP432medium6.3CVSS 3.1
AVNACLPRNUIRSUCLILAL
EPSS
0.29%
21.3th percentile
Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Affected
9 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 | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.10 | Firefox ESR 140.10 |
| mozilla | thunderbird | < Thunderbird 140.10 | Thunderbird 140.10 |
| mozilla | thunderbird | < Thunderbird 150 | Thunderbird 150 |
| mozilla | thunderbird | >= 140.0 < 140.10.0 | 140.10.0 |
| rhel10 | firefox-flatpak | — | — |
CVSS provenance
nvdv3.16.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
vendor_redhat6.1MEDIUM
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Red Hat
firefox: Invalid pointer in the JavaScript: WebAssembly component
vendor_redhat·2026-04-21·CVSS 6.1
CVE-2026-6757 [MEDIUM] CWE-823 firefox: Invalid pointer in the JavaScript: WebAssembly component
firefox: Invalid pointer in the JavaScript: WebAssembly component
Invalid pointer in the JavaScript: WebAssembly 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:
Invalid pointer in the JavaScript: WebAssembly 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) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat Enterprise Linux 7) - Affected
Package: firefox (
Mozilla
Mozilla Foundation Security Advisory 2026-34: CVE-2026-6757
vendor_mozilla
CVE-2026-6757 Mozilla Foundation Security Advisory 2026-34: CVE-2026-6757
Mozilla Foundation Security Advisory 2026-34
CVE: CVE-2026-6757
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-32: CVE-2026-6757
vendor_mozilla
CVE-2026-6757 Mozilla Foundation Security Advisory 2026-32: CVE-2026-6757
Mozilla Foundation Security Advisory 2026-32
CVE: CVE-2026-6757
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6757
vendor_mozilla
CVE-2026-6757 Mozilla Foundation Security Advisory 2026-33: CVE-2026-6757
Mozilla Foundation Security Advisory 2026-33
CVE: CVE-2026-6757
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 150
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6757
vendor_mozilla
CVE-2026-6757 Mozilla Foundation Security Advisory 2026-30: CVE-2026-6757
Mozilla Foundation Security Advisory 2026-30
CVE: CVE-2026-6757
Product: Firefox
Impact: high
Fixed in: Firefox 150
GHSA
GHSA-8mxf-8wh9-g5pv: Invalid pointer in the JavaScript: WebAssembly component
ghsa_unreviewed·2026-04-21
CVE-2026-6757 [MEDIUM] CWE-824 GHSA-8mxf-8wh9-g5pv: Invalid pointer in the JavaScript: WebAssembly component
Invalid pointer in the JavaScript: WebAssembly 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