High · CVSS 7.8CVE-2026-91041

FileX fault-tolerant log replay writes past the destination sector when mounting a crafted FAT imageCVE-2026-91041

Answer in brief

CVE-2026-91041 records a High severity (CVSS 7.8) vulnerability in FileX fault-tolerant log replay writes past the destination sector when mounting a crafted FAT image. The current sources do not mark it as known exploited. The current feed maps Eclipse Foundation/Eclipse ThreadX - FileX (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 20, 2026Updated Oct 20, 2026Source checked Oct 25, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Eclipse Foundation/Eclipse ThreadX - FileX (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Eclipse Foundation/Eclipse ThreadX - FileXgeneric	>=0 <=6.5.1.202602	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Eclipse Foundation/Eclipse ThreadX - FileX.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Oct 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 20, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

Mounting an attacker-controlled FAT image with fault tolerance enabled causes an out-of-bounds heap write during log replay. The write is attacker-positioned and attacker-valued, and on a common embedded memory layout it reaches the FX_MEDIA driver callback, giving control of the instruction pointer.

Quoted source text, attributed separately from HOL analysis.