Skip to content
EXYS
Back to the CVEs

CVE-2026-118688

7.9, 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…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.9, high high CVSS v3.1
EPSS, next 30 days
0.2% higher than 15.3% of scored CVEs
Exploitation
No public evidence
Published
28 Oct 20262 days ago

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.

Details

Vendor
Bytecodealliance
Product
wasmtime
Weakness
CWE-61 (opens in a new tab)
Status
Deferred
Updated
28 Oct 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Bytecodealliance CVEs

Every Bytecodealliance CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-115384 Bytecodealliance wasmtime Improper Input Validation Vulnerability EPSS 0.3% 9.9, critical
  • 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… EPSS 0.2% 7.9, high

Beyond this page

Is CVE-2026-118688 in your network?

This page tells you how dangerous CVE-2026-118688 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-118688 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 30 Oct 2026, not the live upstream state.