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TI-2024-25616 Aliases CVE-2024-38358GHSA-55f3-3qvg-8pv5

Symlink bypasses filesystem sandbox in wasmer

Priority MEDIUM 48CWE-22Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

Wasmer is a web assembly (wasm) Runtime supporting WASIX, WASI and Emscripten. If the preopened directory has a symlink pointing outside, WASI programs can traverse the symlink and access host filesystem if the caller sets both `oflags::creat` and `rights::fd_write`. Programs can also crash the runtime by creating a symlink pointing outside with `path_symlink` and `path_open`ing the link. This issue has been addressed in commit `b9483d022` which has been included in release version 4.3.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.002 9th percentileScored 2026-11-07
Fix Fixed wasmer (wasmerio): 4.3.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
wasmeriowasmerbefore 4.3.24.3.2Patch availableCNA
—wasmer (crates.io)up to 4.3.1—No fix listedGHSA-55f3-3qvg-8pv5
  • wasmer Vendorwasmerio Affected before 4.3.2 Fixed in 4.3.2 Patch available CNA
  • wasmer (crates.io) Vendor— Affected up to 4.3.1 Fixed in — No fix listed GHSA-55f3-3qvg-8pv5

CPE names CISA-ADP · 1

CPEVersionsRoleVendor
cpe:2.3:a:wasmer:wasmer:*:*:*:*:*:rust:*:*——Wasmer
  • cpe:2.3:a:wasmer:wasmer:*:*:*:*:*:rust:*:* Versions — — ·Wasmer

Remediation

  • Fix · CNA wasmer (wasmerio) Fixed in 4.3.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-38358
  2. 2026-10-03 Alias added: GHSA-55f3-3qvg-8pv5

References

Advisory 1

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences