LangChain is a framework for building LLM-powered applications. Prior to 1.3.1, MongoDBChatMessageHistory does not enforce the documented string type for an untrusted structured session identifier at runtime, allowing the identifier to be interpreted as a MongoDB query condition rather than as a literal value when multiple users' histories are stored in a shared MongoDB collection. An attacker able to invoke chat-history operations can read, modify, or delete another user's stored conversation. Applications using authenticated, server-controlled string identifiers are not affected. This issue is fixed in version 1.3.1.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-943"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106119.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.5.14"
},
{
"fixed": "1.3.1"
}
],
"source": [
"AFFECTED_FIELD",
"REFERENCES"
]
}