CVE-2026-51882CWE-22path-traversal

CVE-2026-51882

Critical · published October 2, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
34.7
In the wild
Unconfirmed
What it is

The OpenAI-compatible file upload endpoint `/v1/files` in Langchain-Chatchat 0.3.0 is vulnerable to path traversal. An attacker can write files to arbitrary locations outside the `openai_files` directory by crafting malicious filenames.

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
0.00415 · 34.7th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-10-02T02:17Z
References (4)
https://gist.github.com/Ro1ME/f80ac458836b59adb9c6ceff3993f7f3 · [email protected]https://github.com/chatchat-space/Langchain-Chatchat/issues/5468 · [email protected]https://gist.github.com/Ro1ME/f80ac458836b59adb9c6ceff3993f7f3 · 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/chatchat-space/Langchain-Chatchat/issues/5468 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 OCT 03:44Z
    EPSS moved — → 0%
    epss
  • 01 OCT 00:00Z
    The OpenAI-compatible file upload endpoint `/v1/files` in Langchain-Chatchat 0.3.0 is vulnerable to path traversal
    cvelistv5