Vulnerability in Webassembly Wabt
CVE-2025-6273
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".
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (12.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Webassembly Wabt — versions 1.0.0, 1.0.1, 1.0.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/WebAssembly/wabt/issues/2574 (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
- github.com/user-attachments/files/19529411/wabt_crash.txt (Exploit, exploit)
Frequently asked questions
- What is CVE-2025-6273?
- CVE-2025-6273 is a low-severity vulnerability in Webassembly Wabt, classified under Reachable Assertion. CVSS score: 3.3/10. Published 2025-06-19.
- How severe is CVE-2025-6273?
- Low severity. CVSS v3 base score is 3.3 out of 10.