CVE-2025-15412 WebAssembly CVE debrief

Who should care

Defenders responsible for systems using WebAssembly wabt up to version 1.0.39 should assess exposure and prioritize verification of the version in use. Defenders should prioritize verifying the version of WebAssembly wabt in use and assessing if local access could be exploited due to the out-of-bounds read vulnerability. Remediation priority is low due to the low CVSS score. The vulnerability has a low CVSS score of 1.9 and is classified as LOW severity.

Why it matters

Defenders should prioritize verifying the version of WebAssembly wabt in use and assessing if local access could be exploited due to the out-of-bounds read vulnerability.

• Local attackers may exploit this vulnerability to read out-of-bounds data
• Verification of WebAssembly wabt version is required to determine exposure
• Remediation may require updating to a version greater than 1.0.39 if available

Technical summary

The vulnerability is an out-of-bounds read issue in the wabt::Decompiler::VarName function of the WebAssembly wabt component wasm-decompile. Local access is required to approach this attack. The vulnerability has a low CVSS score of 1.9 and is classified as LOW severity. The project has no active maintainer at the moment, and the exploit has been disclosed publicly and may be used. The CVE record and NVD entry provide details about the vulnerability, including its description, CVSS score, and affected versions. However, the project has no active maintainer, and the exploit has been disclosed publicly.

Defensive priority

Defenders should prioritize verifying the version of WebAssembly wabt in use and assessing if local access could be exploited. Remediation priority is low due to the low CVSS score.

Recommended defensive actions

• Verify the version of WebAssembly wabt in use
• Assess if local access could be exploited
• Consider updating to a version greater than 1.0.39 if available
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details about the vulnerability, including its description, CVSS score, and affected versions. However, the project has no active maintainer, and the exploit has been disclosed publicly.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.