High
OneDev: RCE through absolute-path symlink following allows low-privileged users to overwrite arbitrary server via TarUtils.untar
Type: advisorySources: OSV
OneDev is a Git server with CI/CD, kanban, and packages. In versions 15.0.6 and below, TarUtils.untar() creates symbolic links verbatim from TAR entry getLinkName() without validating whether the target is an absolute path. A subsequent file entry in the same archive traverses the symlink, writing to arbitrary server-side locations. This is exploitable by any authenticated user with CI Job write access — no admin interaction required. This is an incomplete fix bypass of CVE-2021-21251 (GHSA-2w6j-wc8c-9mq2): that patch blocked .. path segments but did not address absolute symlink targets. This issue has been fixed in version 15.0.7.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-49248
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 15:10 UTC · Revision 1
Source evidence
OneDev: RCE through absolute-path symlink following allows low-privileged users to overwrite arbitrary server via TarUtils.untar
core-osv · Original sourcePublished 18 Jun 2026, 19:54 UTC
OneDev is a Git server with CI/CD, kanban, and packages. In versions 15.0.6 and below, TarUtils.untar() creates symbolic links verbatim from TAR entry getLinkName() without validating whether the target is an absolute path. A subsequent file entry in the same archive traverses the symlink, writing to arbitrary server-side locations. This is exploitable by any authenticated user with CI Job write access — no admin interaction required. This is an incomplete fix bypass of CVE-2021-21251 (GHSA-2w6j-wc8c-9mq2): that patch blocked .. path segments but did not address absolute symlink targets. This issue has been fixed in version 15.0.7.
osv:CVE-2026-49248
Complete source record
{
"id": "4d7b48b47231b39e5ec1e706cf4dbefddc103f29521ef7bffd3cd22a793e66ec",
"url": "https://osv.dev/vulnerability/CVE-2026-49248",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "OneDev: RCE through absolute-path symlink following allows low-privileged users to overwrite arbitrary server via TarUtils.untar",
"summary": "OneDev is a Git server with CI/CD, kanban, and packages. In versions 15.0.6 and below, TarUtils.untar() creates symbolic links verbatim from TAR entry getLinkName() without validating whether the target is an absolute path. A subsequent file entry in the same archive traverses the symlink, writing to arbitrary server-side locations. This is exploitable by any authenticated user with CI Job write access — no admin interaction required. This is an incomplete fix bypass of CVE-2021-21251 (GHSA-2w6j-wc8c-9mq2): that patch blocked .. path segments but did not address absolute symlink targets. This issue has been fixed in version 15.0.7.",
"evidence": "osv:CVE-2026-49248",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-49248",
"aliases": [
"CVE-2026-49248",
"GHSA-55g8-94r5-cj37"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/theonedev/onedev",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5305a2a5b11f968b13738b54cb78c9065be5ef34"
},
{
"fixed": "4f8684acebc4bfeefd3c7e23a34a4fd591cb27ad"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "15.0.7"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "4f8684acebc4bfeefd3c7e23a34a4fd591cb27ad"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49248.json"
}
}
],
"modified": "2026-10-28T02:30:29.709221376Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49248.json",
"https://github.com/theonedev/onedev/security/advisories/GHSA-55g8-94r5-cj37",
"https://nvd.nist.gov/vuln/detail/CVE-2026-49248",
"https://github.com/theonedev/onedev/commit/4f8684acebc4bfeefd3c7e23a34a4fd591cb27ad"
],
"provider_metadata": {
"cwe_ids": [
"CWE-61"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49248.json"
}
},
"related_cves": [
{
"value": "CVE-2026-49248",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496690,
"published_at": "2026-06-18T19:54:01.665+00:00"
}