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TI-2026-82256 Aliases CVE-2026-118589GHSA-xw74-2wwc-m47q

nschloe meshio VTK Reader uncontrolled memory allocation via DIMENSIONS

Priority LOW 37CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-400.

Summary

A weakness in nschloe meshio up to 5.3.5 lets a remote attacker manipulate the DIMENSIONS argument in the VTK Reader, which is implemented in meshio/_vtk_42.py, and cause uncontrolled memory allocation (CWE-789). The CVSS 4.0 base score is 6.9 (MEDIUM), and no privileges or user interaction are required. The project received an early issue report but has not responded.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

A weakness has been identified in nschloe meshio up to 5.3.5. Impacted is an unknown function of the file meshio/_vtk_42.py of the component VTK Reader. Executing a manipulation of the argument DIMENSIONS can lead to uncontrolled memory allocation. The attack can be executed remotely. The project was informed of the problem early through an issue report but has not responded yet.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00405 35th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
nschloemeshio5.3.0; 5.3.1; 5.3.2; 5.3.3; 5.3.4; 5.3.5—No fix listedCNA
  • meshio Vendornschloe Affected 5.3.0; 5.3.1; 5.3.2; 5.3.3; 5.3.4; 5.3.5 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:nschloe:meshio:*:*:*:*:*:*:*:*——nschloe
  • cpe:2.3:a:nschloe:meshio:*:*:*:*:*:*:*:* Versions — — ·nschloe

Remediation

No fixed version is listed for meshio, and the project has not responded to the issue report. Until a fix is released, do not pass untrusted VTK files to the meshio VTK Reader, or run it in an isolated process with memory limits.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-118589
  2. 2026-10-29 Alias added: GHSA-xw74-2wwc-m47q
  3. 2026-10-29 CISA SSVC decision points changed
  4. 2026-10-29 Priority changed: MEDIUM → LOW
  5. 2026-11-07 Affected versions changed · Red Hat
  6. 2026-11-07 CVSS score added · Red Hat

References

Other 2

Sources

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