CVE-2025-6853: A vulnerability classified as critical has been found in chatchat-space Langchain-Chatchat up to 0.3.1

Q: How do I fix CVE-2025-6853?

langchain-chatchat: upgrade to newer than 0.3.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-6853 being exploited?

CVE-2025-6853 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-6853 affect?

CVE-2025-6853 affects langchain-chatchat. Severity is medium (CVSS 6.3). 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 th

Q: How urgent is CVE-2025-6853?

Priority 39/100. Public exploit reference

Routine

MEDIUM 6.3UPGRADE

CVE-2025-6853 is a medium-severity flaw (CVSS 6.3) affecting langchain-chatchat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-22
Published	2025-06-29
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: chatchat-space

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-29 08:15 UTCPublished CVE record published
2026-06-17 10:02 UTCUpdated Record last modified

chatchat-space langchain-chatchat UPGRADE

Affected: <= 0.3.1

Fixed in: newer than 0.3.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy langchain-chatchat || rpm -q langchain-chatchat || langchain-chatchat --version

2. UPGRADE to newer than 0.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade langchain-chatchat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade langchain-chatchat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-6853?

langchain-chatchat: upgrade to newer than 0.3.1. Exact commands for each OS are on this page.

Is CVE-2025-6853 being exploited?

CVE-2025-6853 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-6853 affect?

CVE-2025-6853 affects langchain-chatchat. Severity is medium (CVSS 6.3). 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 th

How urgent is CVE-2025-6853?

Priority 39/100. Public exploit reference

Software pages

OpenAI and LLM tools vulnerabilities

Related CVEs

CVE-2025-6855 MEDIUM 5.5 UPGRADE A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0
CVE-2025-6854 MEDIUM 4.3 UPGRADE A vulnerability classified as problematic was found in chatchat-space Langchain-Chatchat up to 0.3.1

References

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