RUSTSEC-2026-0066 (GHSA-6GX3-4362-RF54)
Vulnerability from osv_rustsec – Published: 2026-03-17 12:00 – Updated: 2026-03-23 09:31 – Source websiteIn versions 0.5.6 and earlier of astral-tokio-tar, 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.
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"categories": [],
"cvss": "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",
"informational": null
},
"ecosystem_specific": {
"affected_functions": null,
"affects": {
"arch": [],
"functions": [],
"os": []
}
},
"package": {
"ecosystem": "crates.io",
"name": "astral-tokio-tar",
"purl": "pkg:cargo/astral-tokio-tar"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.0-0"
},
{
"fixed": "0.6.0"
}
],
"type": "SEMVER"
}
],
"versions": []
}
],
"aliases": [
"GHSA-6gx3-4362-rf54",
"CVE-2026-32766"
],
"database_specific": {
"license": "CC0-1.0"
},
"details": "In versions 0.5.6 and earlier of astral-tokio-tar, malformed PAX extensions\nwere silently skipped when parsing tar archives. This silent skipping (rather\nthan rejection) of invalid PAX extensions could be used as a building block for\na parser differential, for example by silently skipping a malformed GNU \"long\nlink\" extension so that a subsequent parser would misinterpret the extension.\n\nIn practice, exploiting this behavior in astral-tokio-tar requires a secondary\nmisbehaving tar parser, i.e. one that insufficiently validates malformed PAX\nextensions and interprets them rather than skipping or erroring on them. This\nvulnerability is considered low-severity as it requires a separate\nvulnerability against any unrelated tar parser.\n\nThis issue has been fixed in version 0.6.0.",
"id": "RUSTSEC-2026-0066",
"modified": "2026-03-23T09:31:59Z",
"published": "2026-03-17T12:00:00Z",
"references": [
{
"type": "PACKAGE",
"url": "https://crates.io/crates/astral-tokio-tar"
},
{
"type": "ADVISORY",
"url": "https://rustsec.org/advisories/RUSTSEC-2026-0066.html"
}
],
"related": [],
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Insufficient validation of PAX extensions during extraction"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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