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CVE-2025-6273— WebAssembly wabt binary-reader-objdump.cc LogOpcode assertion

Quick assessment

Affected
WebAssembly wabt
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.

WebAssembly wabt是WebAssembly开源的一个WebAssembly二进制工具包。 WebAssembly wabt 1.0.37及之前版本存在安全漏洞，该漏洞源于文件src/binary-reader-objdump.cc中函数LogOpcode存在可达断言。

CVSS 3.3 · Low EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth
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I. Basic Information for CVE-2025-6273

Vulnerability Information
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Vulnerability Title
WebAssembly wabt binary-reader-objdump.cc LogOpcode assertion
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in WebAssembly wabt up to 1.0.37 and classified as problematic. This issue affects the function LogOpcode of the file src/binary-reader-objdump.cc. The manipulation leads to reachable assertion. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. The real existence of this vulnerability is still doubted at the moment. The code maintainer explains that this issue might not affect "real world wasm programs".
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
WebAssembly wabt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WebAssembly wabt是WebAssembly开源的一个WebAssembly二进制工具包。 WebAssembly wabt 1.0.37及之前版本存在安全漏洞，该漏洞源于文件src/binary-reader-objdump.cc中函数LogOpcode存在可达断言。
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
WebAssembly wabt 1.0.0 -

II. Public POCs for CVE-2025-6273

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III. Intelligence Information for CVE-2025-6273

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Patches & Fixes for CVE-2025-6273 (1)

Other References for CVE-2025-6273 (1)

Same Patch Batch · WebAssembly · 2025-06-19 · 3 CVEs total

CVE-2025-6275 3.3 LOW WebAssembly wabt binary-reader-interp.cc GetFuncOffset use after free
CVE-2025-6274 3.3 LOW WebAssembly wabt binary-reader-interp.cc OnDataCount resource consumption

IV. Related Vulnerabilities

Same product: wabt
Same vendor: WebAssembly
Same weakness: CWE-617

V. Comments for CVE-2025-6273

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