Vulnerability in Bytecodealliance Wasmtime
CVE-2026-115392
Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 allows a filesystem sandbox escape in wasmtime-wasi because its cap-std dependency mishandles symlinks with trailing slashes on macOS and Linux kernels lacking openat2. A guest with write access to any sandboxed directory can read and write any host-accessible file, and read-only guests may read host files via preexisting symlinks.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.9 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/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
Weakness classification (CWE)
References
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-vqjp-4c8c-hfgg (vendor-advisory)
- www.vulncheck.com/advisories/wasmtime-before-24.0.13-25.0.0-before-36.0.14-37.0… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115392?
- CVE-2026-115392 is a high-severity vulnerability in Bytecodealliance Wasmtime, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 7.9/10. Published 2026-10-22.
- How severe is CVE-2026-115392?
- High severity. CVSS v3 base score is 7.9 out of 10.