Vulnerability in Astral Astral-Tokio-Tar
CVE-2026-32766
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Astral Astral-Tokio-Tar
- Astral-Sh Tokio-Tar — versions < 0.6.0
Weakness classification (CWE)
References
- github.com/astral-sh/tokio-tar/security/advisories/GHSA-6gx3-4362-rf54 (Mitigation, Vendor Advisory)
- github.com/astral-sh/tokio-tar/commit/e5e0139cae4577eeedf5fc16b65e690bf988ce52 (Patch)
Frequently asked questions
- What is CVE-2026-32766?
- CVE-2026-32766 is a medium-severity vulnerability in Astral Astral-Tokio-Tar, classified under CWE-436. CVSS score: 5.3/10. Published 2026-03-20.
- How severe is CVE-2026-32766?
- Medium severity. CVSS v3 base score is 5.3 out of 10.