Disclosure summary
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.
Source-reported weakness categories
CWE-843
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2025-62518
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
Microsoft Security Updates (CVRF) · 2025-Oct
Open original source · Updated Jan 20, 2026
astral-tokio-tar Vulnerable to PAX Header Desynchronization
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 8.1
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 kata-containers-cc 3.15.0.aks0-6 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 kata-containers-cc 3.15.0.aks0-5 on Azure Linux 3.0 | (MSRC status code 3) |
Risky Business · RSS-34f9e10a973df029c010791e2b7f82e829a
Open original source · Updated Oct 21, 2025
Risky Business #811 -- F5 is the tip of the crap software iceberg
CVE mention in publisher metadata; check the original affected versions.
Original records & references
PUBLISHED 2025-10-21T13:15:40-04:00
MODIFIED 2026-10-08T07:10:00-04:00
INGESTED 2026-10-08T12:30:43-04:00