Medium
tarfile.data_filter path traversal bypass allows writing outside the extraction directory
Type: advisorySources: OSV
tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-7774
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 03:34 UTC · Revision 1
Source evidence
tarfile.data_filter path traversal bypass allows writing outside the extraction directory
core-osv · Original sourcePublished 4 Jun 2026, 14:21 UTC
tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.
osv:CVE-2026-7774
Complete source record
{
"id": "d1f24e5b995a3ac691f62a9d9079d3ef8a58fbef7652c21e93069018a1ad29c6",
"url": "https://osv.dev/vulnerability/CVE-2026-7774",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "tarfile.data_filter path traversal bypass allows writing outside the extraction directory",
"summary": "tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.",
"evidence": "osv:CVE-2026-7774",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-7774",
"aliases": [
"BIT-libpython-2026-7774",
"BIT-python-2026-7774",
"BIT-python-min-2026-7774",
"CVE-2026-7774",
"PSF-2026-26"
],
"metrics": [
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"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
}
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"modified": "2026-10-28T02:30:32.842514931Z",
"provider": "osv",
"references": [
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"https://mail.python.org/archives/list/security-announce@python.org/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/",
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"published_at": "2026-06-04T14:21:23.904+00:00"
}