Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS (CVE-2026-54417) | HOL Guard CVE

High · CVSS 7.5CVE-2026-54417

Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS

Answer in brief

CVE-2026-54417 records a High severity (CVSS 7.5) vulnerability in Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS. 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 7.5
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 7.5. 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

An integer overflow in the mtar_next function in src/microtar.c in rxi microtar 0.1.0 allows a remote attacker to cause a denial of service (uncontrolled CPU consumption / infinite loop) via a crafted tar archive. mtar_next computes the offset to the next record as round_up(h.size, 512) + sizeof(mtar_raw_header_t) using 32-bit arithmetic.

Quoted source text, attributed separately from HOL analysis.