tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all() (CVE-2026-70622) | HOL Guard CVE

Medium · CVSS 6.5CVE-2026-70622

tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all()

Answer in brief

CVE-2026-70622 records a Medium severity (CVSS 6.5) vulnerability in tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all(). The current sources do not mark it as known exploited. The current feed maps composefs/tar-rs (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 Aug 10, 2026Updated Aug 11, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 11, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
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 6.5. 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 composefs/tar-rs (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
composefs/tar-rsgeneric	0.4.11	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for composefs/tar-rs.
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
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.

Quoted source text, attributed separately from HOL analysis.