Is there a public exploit for CVE-2026-118688?

No public exploit for CVE-2026-118688 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-118688?

CVE-2026-118688 scores CVSS 8.8 (v4.0), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.24%.

What does CVE-2026-118688 affect?

CVE-2026-118688 affects bytecodealliance wasmtime.

8.8 High

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…

CVE-2026-118688

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.

Assessment

CVSS: 8.8 (v4.0)
Severity: High
EPSS: 0.24% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 October 2026
Last updated: 4 November 2026
Affected: bytecodealliance · wasmtime
Weakness: CWE-61
Assigner: disclosure@vulncheck.com

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L

At the source

References

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