tar-rs up to 0.4.46 Builder Builder::append_dir_all symlink

Summaryinfo

A vulnerability was found in tar-rs up to 0.4.46 and classified as problematic. Impacted is the function Builder::append_dir_all of the component Builder. Executing a manipulation can lead to symlink. This vulnerability is tracked as CVE-2026-70622. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in tar-rs up to 0.4.46 and classified as problematic. This vulnerability affects the function Builder::append_dir_all of the component Builder. The manipulation with an unknown input leads to a symlink vulnerability. The CWE definition for the vulnerability is CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at gist.github.com. This vulnerability was named CVE-2026-70622 since 08/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• tar-rs

Version

• 0.4.0
• 0.4.1
• 0.4.2
• 0.4.3
• 0.4.4
• 0.4.5
• 0.4.6
• 0.4.7
• 0.4.8
• 0.4.9
• 0.4.10
• 0.4.11
• 0.4.12
• 0.4.13
• 0.4.14
• 0.4.15
• 0.4.16
• 0.4.17
• 0.4.18
• 0.4.19
• 0.4.20
• 0.4.21
• 0.4.22
• 0.4.23
• 0.4.24
• 0.4.25
• 0.4.26
• 0.4.27
• 0.4.28
• 0.4.29
• 0.4.30
• 0.4.31
• 0.4.32
• 0.4.33
• 0.4.34
• 0.4.35
• 0.4.36
• 0.4.37
• 0.4.38
• 0.4.39
• 0.4.40
• 0.4.41
• 0.4.42
• 0.4.43
• 0.4.44
• 0.4.45
• 0.4.46

CPE 2.3info

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CPE 2.2info

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