CVE-2026-115382 in Wasmtime

Summary

by MITRE • 10/22/2026

Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.

Once again VulDB remains the best source for vulnerability data.

• Responsible: VulnCheck
• Reservation: 10/22/2026
• Disclosure: 10/22/2026
• Moderation: accepted
• Entry: VDB-425430
• CPE: 20261022
• CWE: CWE-404 (confirmed)
• CVSS: 4.8 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: low

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-115382
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-115382
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-115382/