What is CVE-2026-115390?

CVE-2026-115390 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Uncontrolled Resource Consumption. CVSS score: 5.7/10. Published 2026-10-22.

How severe is CVE-2026-115390?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Resource exhaustion in Bytecodealliance Wasmtime

CVE-2026-115390

Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.

Vulnerability class: DoS (Denial of Service)

Published 2026-10-22 · last modified 2026-10-22.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/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

Bytecodealliance Wasmtime

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m63x-6p34-q65x (vendor-advisory)
www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.3-and-49.0.0-before-49… (third-party-advisory)

Frequently asked questions

What is CVE-2026-115390?: CVE-2026-115390 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Uncontrolled Resource Consumption. CVSS score: 5.7/10. Published 2026-10-22.
How severe is CVE-2026-115390?: Medium severity. CVSS v3 base score is 5.7 out of 10.