dignifiedquire async-tar up to 0.6.0 PAX Header Parser src/archive.rs poll_next_raw input validation

Summaryinfo

A vulnerability classified as critical has been found in dignifiedquire async-tar up to 0.6.0. The impacted element is the function poll_next_raw of the file src/archive.rs of the component PAX Header Parser. Performing a manipulation results in input validation. This vulnerability is cataloged as CVE-2026-53600. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in dignifiedquire async-tar up to 0.6.0. It has been classified as critical. This affects the function poll_next_raw of the file src/archive.rs of the component PAX Header Parser. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

async-tar is a tar archive reading/writing library for async Rust. Prior to version 0.6.1, async-tar mis-applies a buffered PAX size extension to an intermediary extension header (a GNU longname L, a GNU longlink K, or a PAX x/g header) instead of to the next file entry. POSIX requires a PAX extended-header record set to describe the next file entry, never an intervening extension header. Because poll_next_raw (src/archive.rs) threads the buffered PAX records into the size computation of whatever raw header it reads next — and that header can be an intermediary L — the stream cursor is advanced by an attacker-chosen amount when the L body is consumed. The parser then desyncs relative to a POSIX-correct tar parser (e.g. GNU tar), reading subsequent bytes at the wrong block boundary. This issue has been patched in version 0.6.1.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-53600 since 06/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 0.6.1 eliminates this vulnerability.

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Productinfo

Vendor

• dignifiedquire

Name

• async-tar

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6.0

Website

• Product: https://github.com/dignifiedquire/async-tar/

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