CVE-2026-32766

The record

astral-tokio-tar is a tar archive reading/writing library for async Rust. In versions 0.5.6 and earlier, malformed PAX extensions were silently skipped when parsing tar archives. This silent skipping (rather than rejection) of invalid PAX extensions could be used as a building block for a parser differential, for example by silently skipping a malformed GNU “long link” extension so that a subsequent parser would misinterpret the extension. In practice, exploiting this behavior in astral-tokio-tar requires a secondary misbehaving tar parser, i.e. one that insufficiently validates malformed PAX extensions and interprets them rather than skipping or erroring on them. This vulnerability is considered low-severity as it requires a separate vulnerability against any unrelated tar parser. This issue has been fixed in version 0.6.0.

Affected packages

Related vulnerabilities

• RUSTSEC-2026-0066 Insufficient validation of PAX extensions during extraction Same vulnerability
• RUSTSEC-2026-0145 PAX Header Desynchronization in astral-tokio-tar Also affects astral-tokio-tar
• RUSTSEC-2026-0113 `unpack_in` can chmod arbitrary directories by following symlinks Also affects astral-tokio-tar
• RUSTSEC-2026-0112 PAX Header Desynchronization in astral-tokio-tar Also affects astral-tokio-tar
• CVE-2025-62518 astral-tokio-tar is a tar archive reading/writing library for async Rust. Also affects astral-tokio-tar
• CVE-2026-31812 Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. Also affects uv
• CVE-2026-25727 time provides date and time handling in Rust. Also affects uv
• CVE-2026-25541 Bytes is a utility library for working with bytes. Also affects uv