Medium
LangChain: Path traversal and sandbox escape in LangChain file-search middleware and loaders
Type: advisorySources: OSV
LangChain is a framework for building agents and LLM-powered applications. Prior to 1.3.9, several LangChain components that resolve filesystem paths or expand search patterns do not consistently confine the resolved path to the intended root directory. Affected behaviors include: a file-search agent middleware that validates a starting directory but not the search pattern or the resolved target of matched files, so glob patterns and symlinks can reach files outside the configured root; prompt- and chain/agent-configuration loaders that accept path fields and resolve them without confining the result to a trusted base or rejecting symlink targets; and path-prefix authorization checks that compare by string prefix without a path-segment boundary, so a sibling path sharing the prefix is accepted. When these components receive path values, search patterns, or workspace contents influenced by an untrusted source — including an LLM acting on untrusted input — the result can be disclosure of files outside the intended boundary. This vulnerability is fixed in 1.3.9.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55443
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 22:32 UTC · Revision 1
Source evidence
LangChain: Path traversal and sandbox escape in LangChain file-search middleware and loaders
core-osv · Original sourcePublished 22 Jun 2026, 17:21 UTC
LangChain is a framework for building agents and LLM-powered applications. Prior to 1.3.9, several LangChain components that resolve filesystem paths or expand search patterns do not consistently confine the resolved path to the intended root directory. Affected behaviors include: a file-search agent middleware that validates a starting directory but not the search pattern or the resolved target of matched files, so glob patterns and symlinks can reach files outside the configured root; prompt- and chain/agent-configuration loaders that accept path fields and resolve them without confining the result to a trusted base or rejecting symlink targets; and path-prefix authorization checks that compare by string prefix without a path-segment boundary, so a sibling path sharing the prefix is accepted. When these components receive path values, search patterns, or workspace contents influenced by an untrusted source — including an LLM acting on untrusted input — the result can be disclosure of files outside the intended boundary. This vulnerability is fixed in 1.3.9.
osv:CVE-2026-55443
Complete source record
{
"id": "10a86c687176b2bdbf2f861d8c0ef660f15dbc772343e9ff5eff1b61457a8318",
"url": "https://osv.dev/vulnerability/CVE-2026-55443",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "LangChain: Path traversal and sandbox escape in LangChain file-search middleware and loaders",
"summary": "LangChain is a framework for building agents and LLM-powered applications. Prior to 1.3.9, several LangChain components that resolve filesystem paths or expand search patterns do not consistently confine the resolved path to the intended root directory. Affected behaviors include: a file-search agent middleware that validates a starting directory but not the search pattern or the resolved target of matched files, so glob patterns and symlinks can reach files outside the configured root; prompt- and chain/agent-configuration loaders that accept path fields and resolve them without confining the result to a trusted base or rejecting symlink targets; and path-prefix authorization checks that compare by string prefix without a path-segment boundary, so a sibling path sharing the prefix is accepted. When these components receive path values, search patterns, or workspace contents influenced by an untrusted source — including an LLM acting on untrusted input — the result can be disclosure of files outside the intended boundary. This vulnerability is fixed in 1.3.9.",
"evidence": "osv:CVE-2026-55443",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-55443",
"aliases": [
"CVE-2026-55443",
"GHSA-gr75-jv2w-4656",
"PYSEC-2026-2192",
"PYSEC-2026-2556"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/langchain-ai/langchain",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "3bfb6a33e788aaca1626a7c09cbdbdbef6977012"
},
{
"fixed": "dcaf7795a3e6590af55c3ff7bda6add6355e9ea6"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:langchain:langchain:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.3.9"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "dcaf7795a3e6590af55c3ff7bda6add6355e9ea6"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55443.json"
}
}
],
"modified": "2026-10-28T02:30:24.153689283Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55443.json",
"https://github.com/langchain-ai/langchain/security/advisories/GHSA-gr75-jv2w-4656",
"https://nvd.nist.gov/vuln/detail/CVE-2026-55443",
"https://github.com/langchain-ai/langchain/commit/dcaf7795a3e6590af55c3ff7bda6add6355e9ea6"
],
"provider_metadata": {
"cwe_ids": [
"CWE-22",
"CWE-59"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55443.json"
}
},
"related_cves": [
{
"value": "CVE-2026-55443",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490564,
"published_at": "2026-06-22T17:21:46.121+00:00"
}