CVE-2026-100788

CriticalCVSS 9.8/10Last modified Oct 19, 2026

Description

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-824

Affected software

VendorProductVersions
MozillaThunderbird—
MozillaFirefox—

References

Timeline

Published
Sep 29, 2026
Last modified
Oct 19, 2026
NVD status
Analyzed

Related CVEs from 2026

CVE-2026-1007898.8Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, CVE-2026-100798.5A flaw was found in Red Hat Advanced Cluster Security for Kubernetes (RHACS). When processing Kubernetes Deployments, ACS replaces deploymenCVE-2026-1007908.8Use-after-free in the XSLT component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 15CVE-2026-1007918.8Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, ThCVE-2026-1007927.1JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, ThunderbirdCVE-2026-1007936.5JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.CVE-2026-1007949.6Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4CVE-2026-1007956.5Denial-of-service in the Networking component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.CVE-2026-1007968.8Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.CVE-2026-1007978.8Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, ThunderbCVE-2026-1007988.1Cryptography misuse in Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153CVE-2026-1007994.3Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
CVE-2026-100788: Critical severity, CVSS 9.8 | Vulnix