WebAssembly wabt up to 1.0.37 binary-reader-interp.cc GetFuncOffset use after free

Summaryinfo

A vulnerability, which was classified as problematic, has been found in WebAssembly wabt up to 1.0.37. Affected is the function GetFuncOffset of the file src/interp/binary-reader-interp.cc. This manipulation causes use after free. The identification of this vulnerability is CVE-2025-6275. The attack can only be executed locally. Furthermore, there is an exploit available. A similar issue reported during the same timeframe was disputed by the code maintainer because it might not affect "real world wasm programs". Therefore, this entry might get disputed as well in the future.

Detailsinfo

A vulnerability was found in WebAssembly wabt up to 1.0.37. It has been declared as problematic. Affected by this vulnerability is the function GetFuncOffset of the file src/interp/binary-reader-interp.cc. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-6275. The exploitation appears to be easy. Attacking locally is a requirement. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. A similar issue reported during the same timeframe was disputed by the code maintainer because it might not affect "real world wasm programs". Therefore, this entry might get disputed as well in the future.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-18695). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• WebAssembly

Name

• wabt

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18
• 1.0.19
• 1.0.20
• 1.0.21
• 1.0.22
• 1.0.23
• 1.0.24
• 1.0.25
• 1.0.26
• 1.0.27
• 1.0.28
• 1.0.29
• 1.0.30
• 1.0.31
• 1.0.32
• 1.0.33
• 1.0.34
• 1.0.35
• 1.0.36
• 1.0.37

Website

• Product: https://github.com/WebAssembly/wabt/

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Submitinfo

Accepted

• Submit #593017: WebAssembly wabt wabt 1.0.37 (commit a60eb26) Use After Free (by JJLeo)

Be aware that VulDB is the high quality source for vulnerability data.

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