Stack Buffer Overflow in rxi/microtar raw_to_header() via non-null-terminated TAR name field (CVE-2026-55738) | HOL Guard CVE

High · CVSS 8.8CVE-2026-55738

Stack Buffer Overflow in rxi/microtar raw_to_header() via non-null-terminated TAR name field

Answer in brief

CVE-2026-55738 records a High severity (CVSS 8.8) vulnerability in Stack Buffer Overflow in rxi/microtar raw_to_header() via non-null-terminated TAR name field. The current sources do not mark it as known exploited. The current feed maps rxi/microtar (generic), rxi/microtar (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 Jun 17, 2026Updated Aug 10, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.8. 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 rxi/microtar (generic), rxi/microtar (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
rxi/microtargeneric	0.1.0	Not reported
rxi/microtargeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for rxi/microtar, rxi/microtar.
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
Jun 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

A stack-based buffer overflow exists in the raw_to_header function in src/microtar.c in rxi microtar 0.1.0. The function copies the 100-byte name and linkname fields of a TAR header with strcpy without guaranteeing null termination of the source.

Quoted source text, attributed separately from HOL analysis.