Skip to content
VulniPulse
Sign in
Advisory severityMedium6.5Red Hat Linux

Medium [CVE-2026-58494] Overwrite host files via insufficient permission checks in wasmtime-wasi

This medium-severity Red Hat Linux advisory covers CVE-2026-58494 affecting Red Hat Connectivity Link 1, Red Hat Enterprise Linux 10, Red Hat package: virt-firmware-rs.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-58494 Source published Source updated

VulniPulse record published Record updated

CVE-2026-58494
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

Wasmtime is a runtime for WebAssembly.

Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite host files exposed as FilePerms::READ through wasip1, wasip2, or wasip3 filesystem interfaces.

This issue is fixed in versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1. This Moderate-impact flaw in Wasmtime allows a malicious WebAssembly System Interface (WASI) guest to overwrite host files.

By exploiting insufficient permission checks during hard-link and rename operations, a guest with read-only file capabilities can modify host files that are exposed with read permissions through WASI filesystem interfaces. This could lead to data integrity issues on the host system.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N). Weakness: CWE-280.

Affected Red Hat products: Red Hat Connectivity Link 1; Red Hat Enterprise Linux 10. Red Hat lists Red Hat Hardened Images as not affected.

Red Hat does not currently list a fixing RHSA for this CVE.

Affected products named by the advisory: Red Hat package: virt-firmware-rs.

Is CVE-2026-58494 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-58494 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-58494?

Upgrade to a fixed release named by Red Hat:

  • 24.0.11
  • 36.0.12
  • 45.0.3
  • 46.0.1

Confirm against the vendor advisory before you patch.

Affected versions
  • < 24.0.11
  • < 36.0.12
  • < 45.0.3
  • < 46.0.1

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions
  • 24.0.11
  • 36.0.12
  • 45.0.3
  • 46.0.1

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation

Upgrade to a fixed release: 24.0.11, 36.0.12, 45.0.3, 46.0.1. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Get an email when Red Hat RHEL & SELinux publishes the next one.

See Red Hat RHEL & SELinux's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).

Alert me about Red Hat RHEL & SELinux

More Red Hat Linux advisories

All Red Hat Linux advisories

iPhone and Android apps · New on the App Store

Monitor future Red Hat Linux CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Download on the App StoreGet CVE alerts on AndroidSee app features

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.

Sign in to join the discussion.