What is GHSA-63fr-xrxj-8wrx?

GHSA-63fr-xrxj-8wrx is a security advisory published by GitHub Security Advisories with High severity. wasmtime-wasi in Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 re...

Which CVE IDs does GHSA-63fr-xrxj-8wrx cover?

GHSA-63fr-xrxj-8wrx covers the following CVE IDs: CVE-2026-118688. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-63fr-xrxj-8wrx?

GHSA-63fr-xrxj-8wrx has a CVSS v3 base score of 7.9, published by GitHub Security Advisories.

GHSA-63fr-xrxj-8wrxHighCVSS 7.9

wasmtime-wasi in Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 re...

Vendor

GitHub Security Advisories

Published

October 28, 2026

Last Modified

October 28, 2026

🔗 CVE IDs covered (1)

CVE-2026-118688 →

📋 Description

wasmtime-wasi in Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 re-appends a trailing slash to rename source paths, causing renameat on macOS and FreeBSD hosts to follow directory symlinks. A guest with sandbox write access can rename a relative symlink such as "up/" to move host directories into its sandbox and read or write them.

🔗 References (4)

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9f7-9w4p-gv38
https://nvd.nist.gov/vuln/detail/CVE-2026-118688
https://www.vulncheck.com/advisories/wasmtime-before-36.0.18-37.0.0-before-48.0.6-and-49.0.0-before-49.0.3-sandbox-escape-via-symlink-rename
https://github.com/advisories/GHSA-63fr-xrxj-8wrx