CVE-2026-8389

CVE-2026-8389 This vulnerability was intended to be used at Pwn2Own 2026 Berlin, but was patched in version 150.0.3. SpiderMonkey BaselineJIT pcOffset bitfield truncation on the eager off-thread baseline-compile path, leading to a wrong-but-in-bounds bytecode pc during exception unwinding and a...

CVE-2024-8381

CVE-2024-8381 A SpiderMonkey Interpreter Type Confusion Bug. This repository contains analyses in markdown and slide forms, including root cause, PoC, and exploit. Unfortunately, due to nature of this bug, exploit is only applicable when ASLR is disabled. Slides: Slides.pdf Analysis: Analysis.md...

btr

Branch Target Reuse BTR Artifacts This repository contains the artifacts for the paper "Branch Target Reuse: Practical Spectre-v2 Attacks in JIT Engines via Stale Branch Prediction Entries" accepted at ACM CCS 2026. For more information about the BTR attack, see our project-page and our paper! bt...

CVE-2024-29943

CVE-2024-29943 Un bug de JIT de SpiderMonkey de Pwn2Own: Desde inconsistencia en el rango de enteros hasta eliminación de comprobación de límites y luego RCE. Este repositorio contiene PoC, Exploit y Diapositivas de Análisis para CVE-2024-29943. Demo Demo.mp4 Diapositivas Slides.pdf Información...

CVE-2026-2796-escape-wasm-by-using-wasm

CVE-2026-2796 — SpiderMonkey WebAssembly Sandbox Escape Proof-of-concept exploit chain for CVE-2026-2796 , a JIT miscompilation / type-confusion in Mozilla SpiderMonkey's WebAssembly import optimization "JavaScript: WebAssembly" component. A crafted wasm module obtains arbitrary read/write of the...

CVE-2026-15718-who-put-ptrs-in-my-wasm

CVE-2026-15718 — who put ptrs in my wasm Proof-of-concept exploit chain for CVE-2026-15718 , a missing-sync miscompilation in Mozilla SpiderMonkey's WebAssembly baseline compiler "JavaScript: WebAssembly" component. A single zero-trip array.fill yields a fakeobj primitive; the chain escalates to...

CVE-2024-29943

CVE-2024-29943 A Pwn2Own SpiderMonkey JIT Bug: From Integer Range Inconsistency to Bound Check Elimination then RCE. Reproducing CVE-2024-29943 for Windows, based on https://github.com/bjrjk/CVE-2024-29943 Modifications The original exploit is written for Linux, so I attempted to reproduce it on...

CVE-2024-29943-but-with-wasm

CVE-2024-29943, but with wasm An end-to-end exploit chain for CVE-2024-29943 that achieves arbitrary native code execution by smuggling shellcode into SpiderMonkey's WebAssembly JIT code page as f64.const immediates — no ROP, no VirtualProtect, no external toolchain. Verified working against the...

CVE-2026-84118-who-labeled-the-crit-as-a-high

CVE-2026-84118 — SpiderMonkey GC use-after-free Bug 2057457 This is one of those where Mozilla labeled a Critical as a High. So someone might want to go have Firefox update the original bug hunters payment if that's the case. THE TLDR: You can do an OOB R primitive on a controlled pointer and the...

CVE-2026-2763-POC

Vulnerability The vulnerability arises from the implementation of the for-in syntax. The scope of a for-in loop is represented by a pair of bytecodes: JSOP::Iter and JSOP::EndIter. CASEIter MOZASSERTREGS.stackDepth = 1; HandleValue val = REGS.stackHandleAt-1; JSObject iter = ValueToIteratorcx, va...

jscpwn

CVE-2016-4622 PoC exploit for CVE-2016-4622. Find a detailed writeup of the bug on phrack...

Rocky Linux 8 [CIQ] Security Update: firefox / firefox-debuginfo / firefox-debugsource Multiple Vulnerabilities (crlsa-2023_4952)

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-20234952 advisory. Mozilla: Memory corruption in IPC CanvasTranslator CVE-2023-4573 Mozilla: Memory corruption in IPC ColorPickerShownCallback CVE-2023-4574 Mozilla: Memory...

New Spectre-v2 BTR Attack Leaks Linux Memory Despite Existing Defenses

A group of academics from VUSec and Scuola Superiore Sant'Anna have disclosed details of a new Spectre CPU vulnerability variant that affects Just-In-Time JIT engines present in web browsers, language runtimes, and the operating system kernel, across multiple CPU vendors. The new Spectre v2 varia...

Exploit for Use After Free in Mozilla Firefox

CVE-2026-84118 — SpiderMonkey GC use-after-free Bug 2057457...

Exploit for Protection Mechanism Failure in Mozilla Firefox

CVE-2026-2796 + CVE-2026-2768 — Escape the Wasm Box Full-chai...

Exploit for Type Confusion in Mozilla Firefox

CVE-2026-2796 — SpiderMonkey WebAssembly Sandbox Escape Proof...

OESA-2026-3213 mozjs102 security update

SpiderMonkey is the code-name for Mozilla Firefox's C++ implementation of JavaScript. It is intended to be embedded in other applications that provide host environments for JavaScript. Security Fixes: Unexpected data returned from the Safe Browsing API could have led to memory corruption and a...

MiracleLinux 8 : thunderbird-102.13.0-2.el8.ML.1 (AXSA:2023-6238:20)

The remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2023-6238:20 advisory. Mozilla: Use-after-free in WebRTC certificate generation CVE-2023-37201 Mozilla: Potential use-after-free from compartment mismatch in SpiderMonkey...

MiracleLinux 9 : thunderbird-102.8.0-2.el9.ML.1 (AXSA:2023-5140:11)

The remote MiracleLinux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2023-5140:11 advisory. Mozilla: Arbitrary memory write via PKCS 12 in NSS CVE-2023-0767 Mozilla: Content security policy leak in violation reports using iframes...

MiracleLinux 7 : firefox-102.13.0-2.0.1.el7.AXS7 (AXSA:2023-6240:25)

The remote MiracleLinux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2023-6240:25 advisory. Mozilla: Use-after-free in WebRTC certificate generation CVE-2023-37201 Mozilla: Potential use-after-free from compartment mismatch in SpiderMonkey...