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Vulnerability record · CVE-2025-62518 · published 21 October 2025

CVE-2025-62518: Type confusion vulnerability

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.

8.1 CVSS 3.1 High EPSS 0.70% · top 48.6% CWE-843 · Type confusion Deferred
8.1CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References

LinkTags
https://edera.dev/stories/tarmageddon
https://github.com/astral-sh/tokio-tar/commit/22b3f884adb7a2adf1d3a8d03469533f5cbc8318
https://github.com/astral-sh/tokio-tar/security/advisories/GHSA-j5gw-2vrg-8fgx
https://github.com/astral-sh/uv/security/advisories/GHSA-w476-p2h3-79g9
https://github.com/edera-dev/cve-tarmageddon

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Source: NIST National Vulnerability Database (record CVE-2025-62518), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.