CVE-2026-34371
Low
No strong exploitation signal.
CVSS base
6.3
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
EPSS — probability of exploitation (30 days)
0.3%
17.9th percentile
CISA KEV
Not listed
Weakness / dates
CWE-22
Published 2026-04-07 · modified 2026-07-24
Description
LibreChat is a ChatGPT clone with additional features. Prior to 0.8.4, LibreChat trusts the name field returned by the execute_code sandbox when persisting code-generated artifacts. On deployments using the default local file strategy, a malicious artifact filename containing traversal sequences (for example, ../../../../../app/client/dist/poc.txt) is concatenated into the server-side destination path and written with fs.writeFileSync() without sanitization. This gives any user who can trigger execute_code an arbitrary file write primitive as the LibreChat server user. This vulnerability is fixed in 0.8.4.