CVE-2026-51883CWE-22path-traversal

CVE-2026-51883

Critical · published October 2, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
27.3
In the wild
Unconfirmed
What it is

The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\`) into the `knowledge_base_name` parameter to write knowledge base content to arbitrary locations outside the configured knowledge base root directory.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00349 · 27.3th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-10-02T02:17Z
References (3)
https://gist.github.com/Ro1ME/30f5139a2920bf7075299a33eb1690f2 · [email protected]https://github.com/chatchat-space/Langchain-Chatchat/issues/5467 · [email protected]https://github.com/chatchat-space/Langchain-Chatchat/issues/5467 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 OCT 03:44Z
    EPSS moved — → 0%
    epss
  • 01 OCT 00:00Z
    The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal
    cvelistv5