Vulnerability in Bytecodealliance Wasmtime
CVE-2026-115382
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-w4qr-p94g-mjhv (vendor-advisory)
- www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.4-and-49.0.0-before-49… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115382?
- CVE-2026-115382 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Improper Validation of Specified Quantity in Input. CVSS score: 4.8/10. Published 2026-10-22.
- How severe is CVE-2026-115382?
- Medium severity. CVSS v3 base score is 4.8 out of 10.