What is CVE-2026-115385?

CVE-2026-115385 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.2/10. Published 2026-10-22.

How severe is CVE-2026-115385?

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

Vulnerability in Bytecodealliance Wasmtime

CVE-2026-115385

Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASIp3 implementation that allows guests to abort the Unix host process. Guests with mutable preopened directory access can call set-times or set-times-at with negative seconds timestamps before the epoch, triggering an assertion failure that crashes the host.

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

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-754 — Improper Check for Unusual or Exceptional Conditions

References

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mr2v-56j5-cmfc (vendor-advisory)
www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.4-and-49.0.0-before-49… (third-party-advisory)

Frequently asked questions

What is CVE-2026-115385?: CVE-2026-115385 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.2/10. Published 2026-10-22.
How severe is CVE-2026-115385?: Medium severity. CVSS v3 base score is 6.2 out of 10.