Vulnerability in Bytecodealliance Wasmtime
CVE-2026-119132
Wasmtime from 49.0.0 before 49.0.3 contains a denial-of-service vulnerability that allows a WebAssembly guest to trigger a host panic by transcoding overlapping strings in fused adapters. Attackers can make a same-instance component-to-component call transferring a string whose source and destination alias each other, crashing the host instead of raising a trap.
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-54p9-vhhq-8f7q (vendor-advisory)
- www.vulncheck.com/advisories/wasmtime-49.0.0-before-49.0.3-host-panic-via-overl… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119132?
- CVE-2026-119132 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Reachable Assertion. CVSS score: 4.8/10. Published 2026-10-29.
- How severe is CVE-2026-119132?
- Medium severity. CVSS v3 base score is 4.8 out of 10.