CVE-2025-6853

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability classified as critical has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This affects the function upload_temp_docs of the file /knowledge_base/upload_temp_docs of the component Backend. The manipulation of the argument flag leads to path traversal. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
39.4%
KEV
Not listed

Published

June 29, 2025

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
No patch confirmed yet.
generic

[Security] /knowledge_base/upload_temp_docs endpoint has a path traversal file writing vulnerability · Issue #5352 · chatchat-space/Langchain-Chatchat · GitHub

https://github.com/chatchat-space/Langchain-Chatchat/issues/5352

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
piplangchain-chatchat—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
langchain-chatchat0.3.0 ... 0.3.1.3 (22 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 116 total refreshes for this CVE.

  1. 2026-07-23 03:02 UTCEG score recompute▲ 3.50
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
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  22. 2026-07-10 10:28 UTCOSV refresh
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  1. 2026-07-06 02:23 UTCEPSS rescore
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  20. 2026-06-24 09:51 UTCNVD updateCVSS v3 → 9.8 · CVSS v4 → 2.1 · severity → CRITICAL
  21. 2026-06-23 21:32 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
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  24. 2026-06-21 20:13 UTCOSV refresh
  25. 2026-06-21 14:56 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-6853?
CVE-2025-6853 is a critical vulnerability published on June 29, 2025. A vulnerability classified as critical has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This affects the function uploadtempdocs of the file /knowledgebase/uploadtemp_docs of the component Backend. The manipulation of the argument flag leads to path traversal. It is possible to…
When was CVE-2025-6853 disclosed?
CVE-2025-6853 was first published in the National Vulnerability Database on June 29, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-6853 actively exploited?
CVE-2025-6853 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-6853?
CVE-2025-6853 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-6853?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-6853, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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