What’s Vulnerable › Vulnerabilities

CVE-2025-6274: WebAssembly wabt binary-reader-interp.cc OnDataCount resource consumption

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-06-19 · updated 2026-06-17
• Weakness: CWE-400

Description

A vulnerability was found in WebAssembly wabt up to 1.0.37. It has been classified as problematic. Affected is the function OnDataCount of the file src/interp/binary-reader-interp.cc. The manipulation leads to resource consumption. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used. 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.

Affected products

• WebAssembly wabt: before 1.0.37 — fixed in 1.0.37

How to fix

Upgrade to a fixed version: WebAssembly wabt 1.0.37. Check the vendor advisory for mitigations.

References

• https://github.com/WebAssembly/wabt/issues/2598
• https://github.com/user-attachments/files/20191325/wabt_crash_4.txt
• https://vuldb.com/?ctiid.313278
• https://vuldb.com/?id.313278
• https://vuldb.com/?submit.593016
• https://github.com/WebAssembly/wabt/issues/2598

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