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CVE-2025-62518

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Date: October 21, 2025

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.

Severity Score

Related Resources (8)

https://edera.dev/stories/tarmageddon
https://github.com/astral-sh/uv/security/advisories/GHSA-w476-p2h3-79g9
https://github.com/astral-sh/tokio-tar/commit/22b3f884adb7a2adf1d3a8d03469533f5cbc8318
https://github.com/edera-dev/cve-tarmageddon
https://nvd.nist.gov/vuln/detail/CVE-2025-62518
https://github.com/astral-sh/tokio-tar/security/advisories/GHSA-j5gw-2vrg-8fgx
https://github.com/astral-sh/tokio-tar
https://www.mend.io/vulnerability-database/CVE-2025-62518

Severity Score

Weakness Type (CWE)

Access of Resource Using Incompatible Type ('Type Confusion')

CWE-843

Top Fix

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Upgrade Version

Upgrade to version astral-tokio-tar - 0.5.6;https://github.com/astral-sh/tokio-tar.git - v0.5.6

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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