High
rust-tar — security advisory
tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.
- Products
- rust-tar
- Affected versions
- 0.4.26-1, 0.4.26-1ubuntu0.1, 0.4.37-1, 0.4.37-3, 0.4.37-3ubuntu0.1, 0.4.37-3ubuntu0.1+esm1, 0.4.37-3ubuntu0.1~esm1, 0.4.38-2, 0.4.40-1, 0.4.40-1ubuntu0.1, 0.4.43-4, 0.4.44-1, 0.4.45-1, 0.4.45-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-70622
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:51 UTC · Revision 1
Source evidence
tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.
osv:UBUNTU-CVE-2026-70622
rust-tar
Fixed versions: Not specified
rust-tar
Fixed versions: Not specified
rust-tar
Fixed versions: Not specified
rust-tar
Fixed versions: Not specified
rust-tar
Fixed versions: Not specified
Complete source record
{
"id": "c32480c2a2ebf52db863c1178d511b28e5a0a239d029584a790c9b33918dfc56",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-70622",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-70622",
"summary": "tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.",
"evidence": "osv:UBUNTU-CVE-2026-70622",
"products": [
{
"name": {
"value": "rust-tar",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4.26-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.4.26-1ubuntu0.1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "rust-tar",
"evidence": "/affected/1/package/name"
},
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"affected_versions": [
{
"value": "0.4.26-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.4.37-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.4.37-3",
"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
}
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},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "0.4.38-2",
"evidence": "/affected/2/versions"
},
{
"value": "0.4.40-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.4.40-1ubuntu0.1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4.45-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.4.45-2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "rust-tar",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4.43-4",
"evidence": "/affected/4/versions"
},
{
"value": "0.4.44-1",
"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-70622",
"aliases": [
"UBUNTU-CVE-2026-70622"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/rust-tar?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"0.4.26-1",
"0.4.26-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-70622.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "librust-tar+default-dev",
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{
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"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
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"0.4.37-1",
"0.4.37-3",
"0.4.37-3ubuntu0.1~esm1",
"0.4.37-3ubuntu0.1",
"0.4.37-3ubuntu0.1+esm1"
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"database_specific": {
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},
"ecosystem_specific": {
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"binary_version": "0.4.37-3ubuntu0.1+esm1"
},
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}
]
}
},
{
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"package": {
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
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"0.4.40-1",
"0.4.40-1ubuntu0.1"
],
"database_specific": {
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},
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"ecosystem": "Ubuntu:26.10"
},
"versions": [
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"0.4.45-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-70622.json"
},
"ecosystem_specific": {
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},
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},
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],
"modified": "2026-10-17T12:59:30.103247049Z",
"provider": "osv",
"upstream": [
"CVE-2026-70622"
],
"references": [
"https://ubuntu.com/security/CVE-2026-70622",
"https://www.cve.org/CVERecord?id=CVE-2026-70622",
"https://gist.github.com/thesmartshadow/e7dac0bb690ee17b9cc142154cb11726",
"https://www.vulncheck.com/advisories/tar-rs-symlink-escape-via-append-dir-all"
]
},
"related_cves": [
{
"value": "CVE-2026-70622",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 359669,
"published_at": "2026-08-10T18:18:00+00:00"
}