Medium
Security advisory
Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink traversal when "umoci unpack" or "umoci raw unpack" is used.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-29136
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:47 UTC · Revision 1
Source evidence
Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink traversal when "umoci unpack" or "umoci raw unpack" is used.
osv:CVE-2021-29136
Complete source record
{
"id": "7c66a7da64736a428e6e432b189054cfea6d13c647d492ae899121d6d395c556",
"url": "https://osv.dev/vulnerability/CVE-2021-29136",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-29136",
"summary": "Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink traversal when \"umoci unpack\" or \"umoci raw unpack\" is used.",
"evidence": "osv:CVE-2021-29136",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-29136",
"aliases": [
"CVE-2021-29136",
"GHSA-9m95-8hx6-7p9v",
"GO-2022-0815"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/apptainer/singularity",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "6e59f31cb97ff59e323850aa1339a38a11358429"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:sylabs:singularity:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.7.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v3.7.2",
"v3.7.1",
"v3.7.0",
"v3.7.0-rc.2",
"v3.7.0-rc.1",
"v3.4.0-rc.1",
"v3.3.0-rc.1",
"v3.2.0-rc1",
"v3.1.0",
"v3.1.0-rc4",
"v3.1.0-rc3",
"v3.1.0-rc2",
"v3.1.0-rc1",
"v3.0.1",
"v3.0.0",
"v3.0.0-beta.1",
"v3.0.0-alpha.1",
"2.4",
"2.3.2",
"2.3.1",
"2.3",
"2.2",
"2.1.2",
"2.1.1",
"2.1",
"2.0",
"1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29136.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/opencontainers/umoci",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "17f38511d61846e2fb8ec01a1532f3ef5525e71d"
},
{
"fixed": "d9efc31daf2206f7d3fdb839863cf7a576a2eb57"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:linuxfoundation:umoci:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.4.7"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "d9efc31daf2206f7d3fdb839863cf7a576a2eb57"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v0.1.0",
"v0.0.0",
"v0.0.0-rc3",
"v0.0.0-rc2",
"v0.0.0-rc1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29136.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/sylabs/singularity",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "6e59f31cb97ff59e323850aa1339a38a11358429"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:sylabs:singularity:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.7.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v3.7.2",
"v3.7.1",
"v3.7.0",
"v3.7.0-rc.2",
"v3.7.0-rc.1",
"v3.4.0-rc.1",
"v3.3.0-rc.1",
"v3.2.0-rc1",
"v3.1.0",
"v3.1.0-rc4",
"v3.1.0-rc3",
"v3.1.0-rc2",
"v3.1.0-rc1",
"v3.0.1",
"v3.0.0",
"v3.0.0-beta.1",
"v3.0.0-alpha.1",
"2.4",
"2.3.2",
"2.3.1",
"2.3",
"2.2",
"2.1.2",
"2.1.1",
"2.1",
"2.0",
"1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29136.json"
}
}
],
"modified": "2026-10-24T10:50:12.365028521Z",
"provider": "osv",
"references": [
"https://github.com/opencontainers/umoci/security/advisories/GHSA-9m95-8hx6-7p9v",
"https://github.com/opencontainers/umoci/commit/d9efc31daf2206f7d3fdb839863cf7a576a2eb57"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-29136",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442050,
"published_at": "2021-04-06T16:15:16.52+00:00"
}