Vulnerability · Published Mar 20, 2026 · Assigned by GitHub_M
CVE-2026-32766astral-tokio-tar insufficiently validates PAX extensions during extraction
Low 1.7
In plain English
A low-severity security flaw in tokio-tar from astral-sh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | rust-astral-tokio-tar | no fix listed | DEBIAN-CVE-2026-32766 |
| Debian:14 | rust-astral-tokio-tar | 0.6.0-1 | DEBIAN-CVE-2026-32766 |
| Ubuntu:25.10 | rust-astral-tokio-tar | no fix listed | UBUNTU-CVE-2026-32766 |
| Ubuntu:26.04:LTS | rust-astral-tokio-tar | no fix listed | UBUNTU-CVE-2026-32766 |
| Ubuntu:26.10 | rust-astral-tokio-tar | no fix listed | UBUNTU-CVE-2026-32766 |
Affected products (as reported)
Weakness: CWE-436 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U