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

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-617

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".

Affected products

WebAssembly wabt: through 1.0.37

References

https://github.com/WebAssembly/wabt/issues/2574
https://github.com/user-attachments/files/19529411/wabt_crash.txt
https://vuldb.com/?ctiid.313277
https://vuldb.com/?id.313277
https://vuldb.com/?submit.593010
https://github.com/WebAssembly/wabt/issues/2574

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