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Advisory record · GHSA-m9f7-9w4p-gv38

Filesystem sandbox escape when renaming symlinks with trailing slashes

CVSS 8.8 HighEPSS 0.0024 · 15th percentile

Published by the GitHub Advisory Database at 14 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtime-wasicrates.io>=0.0.0-0, <36.0.18 || >=37.0.0, <48.0.6 || >=49.0.0, <49.0.336.0.18, 48.0.6, 49.0.3
Identifiers
GHSA-m9f7-9w4p-gv38 · CVE-2026-118688 · RUSTSEC-2026-0352
Weakness (CWE)
CWE-61
Tags
Published
14 Oct 2026
Updated
29 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The wasmtime-wasi crate is vulnerable to a filesystem sandbox escape when renaming symlinks with trailing slashes, in versions before 36.0.18, from 37.0.0 before 48.0.6, and from 49.0.0 before 49.0.3. The source gives few details on the attack conditions or impact. Upgrade to version 36.0.18, 48.0.6, or 49.0.3, depending on your release line.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 15th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 28 Oct 2026, 18:59 UTC Confirmed by the CVE List
  2. 28 Oct 2026, 19:17 UTC Confirmed by NVD
  3. 31 Oct 2026, 14:24 UTC First seen by agentprime
  4. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.