What is CVE-2026-119137?

CVE-2026-119137 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-10-29.

How severe is CVE-2026-119137?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Bytecodealliance Wasmtime

CVE-2026-119137

Wasmtime 42.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a stack overflow vulnerability that allows guests to crash the host through recursive type drops. Guests can define a long chain of recursive types so that removing the top-level type triggers unbounded recursive drops, exhausting the host stack.

Published 2026-10-29 · last modified 2026-10-29.

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

Bytecodealliance Wasmtime

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-wjc8-633q-pwxr (vendor-advisory)
www.vulncheck.com/advisories/wasmtime-42.0.0-before-48.0.6-and-49.0.0-before-49… (third-party-advisory)

Frequently asked questions

What is CVE-2026-119137?: CVE-2026-119137 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-10-29.
How severe is CVE-2026-119137?: Medium severity. CVSS v3 base score is 5.3 out of 10.