Vulnerability in Bytecodealliance Wasmtime
CVE-2026-119141
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious Wasm modules to panic the host because the may_leave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, such as cancelling the active read or re-waiting a waitable-set, crashing the host.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
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-7v24-42x9-pxf7 (vendor-advisory)
- www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119141?
- CVE-2026-119141 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under CWE-1265. CVSS score: 5.3/10. Published 2026-10-29.
- How severe is CVE-2026-119141?
- Medium severity. CVSS v3 base score is 5.3 out of 10.