What is CVE-2026-119134?

CVE-2026-119134 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.2/10. Published 2026-10-29.

How severe is CVE-2026-119134?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Resource exhaustion in Bytecodealliance Wasmtime

CVE-2026-119134

Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 caps component-model resource handle tables only per component instance and does not charge handle allocations to any ResourceLimiter or StoreLimits. A malicious guest can repeatedly call resource.new and instantiate sub-components to exceed the per-instance cap many times over, causing unbounded host memory growth.

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

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/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

Bytecodealliance Wasmtime

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q554-3cjc-rx7p (vendor-advisory)
www.vulncheck.com/advisories/wasmtime-before-36.0.18-37.0.0-before-48.0.6-and-4… (third-party-advisory)

Frequently asked questions

What is CVE-2026-119134?: CVE-2026-119134 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.2/10. Published 2026-10-29.
How severe is CVE-2026-119134?: Medium severity. CVSS v3 base score is 6.2 out of 10.