CVE-2025-62518
Unknown Unknown - Not Provided

BaseFortify

Publication date: 2025-10-21

Last updated on: 2025-10-21

Assigner: GitHub, Inc.

Description
astral-tokio-tar is a tar archive reading/writing library for async Rust. Versions of astral-tokio-tar prior to 0.5.6 contain a boundary parsing vulnerability that allows attackers to smuggle additional archive entries by exploiting inconsistent PAX/ustar header handling. When processing archives with PAX-extended headers containing size overrides, the parser incorrectly advances stream position based on ustar header size (often zero) instead of the PAX-specified size, causing it to interpret file content as legitimate tar headers. This issue has been patched in version 0.5.6. There are no workarounds.

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Meta Information

Published
2025-10-21
Last Modified
2025-10-21
Generated
2026-07-06
AI Q&A
2025-10-21
EPSS Evaluated
2026-07-05
NVD
CVE-2025-62518

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
astral tokio-tar 0.5.5
python uv 0.9.4
python uv 0.9.5
astral tokio-tar 0.5.6

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-843 The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Attack-Flow Graph

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Executive Summary

This vulnerability exists in the astral-tokio-tar library versions prior to 0.5.6. It is a boundary parsing issue where the library incorrectly handles PAX-extended headers with size overrides. Specifically, when processing such archives, the parser advances the stream position based on the ustar header size (often zero) instead of the PAX-specified size. This causes the parser to misinterpret file content as legitimate tar headers, allowing attackers to smuggle additional archive entries.

Impact Analysis

This vulnerability can allow attackers to smuggle additional archive entries into tar files, potentially leading to unauthorized file extraction or manipulation. Because the parser misinterprets file content as headers, it may cause security issues such as data integrity compromise or unauthorized access to files within the archive. The CVSS score indicates high confidentiality and integrity impact, meaning sensitive data could be exposed or altered.

Mitigation Strategies

Update the astral-tokio-tar library to version 0.5.6 or later, as this version contains the patch for the boundary parsing vulnerability. There are no workarounds available.

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