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CVE-2026-58592— Ladybird - Web-Reachable Code Execution via Dangling FunctionType Reference in WebAssembly ESM Integration

Quick assessment

Affected
LadybirdBrowser Ladybird
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ladybird是Ladybird组织开源的一个真正独立的网络浏览器。 Ladybird存在安全漏洞，该漏洞源于WebAssembly ESM-integration module loader中存在释放后重用问题，可能导致任意写入，进而实现WebContent进程中的代码执行。

CVSS 8.3 · High EPSS 0.55% · P46

Affected Version Matrix 1

VendorProduct Version RangeStatus
LadybirdBrowser Ladybird < 2f9dc7e9f35eed67dde3f9e8567d390dc4f0c665 affected
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I. Basic Information for CVE-2026-58592

Vulnerability Information
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Vulnerability Title
Ladybird - Web-Reachable Code Execution via Dangling FunctionType Reference in WebAssembly ESM Integration
Source: CVE Program / CVE List V5
Vulnerability Description
Ladybird before commit 2f9dc7e contains a dangling-reference memory-safety flaw in its WebAssembly ESM-integration module loader. When a JavaScript function is imported into a WebAssembly module via the ESM path, WebAssemblyModule.cpp passes a stack-local Wasm::FunctionType by reference to create_host_function, whose host callback captures and later reads that reference; once the ESM link-loop iteration ends the FunctionType is destroyed, leaving the callback with a dangling reference (the normal instantiate path uses a long-lived reference and is not affected). Stale result-type data lets the host callback return an empty result vector for a statically non-empty result, so the destination register retains an attacker-influenced value that is then consumed by the WASM-GC array.set handler, which bit-casts the reference low bits to an ArrayInstance pointer after only a null check, yielding an arbitrary write. A web page can chain this into code execution in the WebContent process. Verified reachable from HTML content without any instrumentation or source modification.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
无效指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Ladybird 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ladybird是Ladybird组织开源的一个真正独立的网络浏览器。 Ladybird存在安全漏洞，该漏洞源于WebAssembly ESM-integration module loader中存在释放后重用问题，可能导致任意写入，进而实现WebContent进程中的代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LadybirdBrowser Ladybird 0 ~ 2f9dc7e9f35eed67dde3f9e8567d390dc4f0c665 -

II. Public POCs for CVE-2026-58592

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III. Intelligence Information for CVE-2026-58592

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Patches & Fixes for CVE-2026-58592 (3)

Vendor Advisories for CVE-2026-58592 (1)

Proof of Concept for CVE-2026-58592 (1)

Other References for CVE-2026-58592 (1)

IV. Related Vulnerabilities

Same product: Ladybird
Same vendor: LadybirdBrowser
Same weakness: CWE-825