Threats affecting pkg:cargo/astral-sh/tokio-tar

CVE-2026-32766 is a low-severity vulnerability in the astral-tokio-tar Rust library versions prior to 0.6.0. The issue arises from the library silently skipping malformed PAX extensions in tar archives instead of rejecting them. This behavior can enable a parser differential attack when combined with another tar parser that misinterprets these malformed extensions. Exploitation requires a secondary vulnerability in an unrelated tar parser, making this a complex, multi-step attack. No known exploits are currently reported in the wild. The vulnerability affects asynchronous Rust applications using astral-tokio-tar for tar archive processing. It has been fixed in version 0.6.

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.