# CVE-2026-51882

> As of 2026-10-01, CVE-2026-51882 is a vulnerability, EPSS 0.1% (3.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-51882 as of 2026-10-01; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-10-01

## What is CVE-2026-51882?

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 identifier was first published 4 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 3.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 0.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-01

## Is CVE-2026-51882 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

No affected-product or package list has been recorded for CVE-2026-51882 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2026-51882

No vendor patch reference has been recorded for CVE-2026-51882 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-51882

No threat campaign in the Threadlinqs corpus currently references CVE-2026-51882, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-10-04. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [github.com](https://github.com/chatchat-space/Langchain-Chatchat/issues/5468)
- [gist.github.com](https://gist.github.com/Ro1ME/f80ac458836b59adb9c6ceff3993f7f3)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-51882
Full detection coverage and IOCs for threats exploiting CVE-2026-51882 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp