CVE-2025-6855: A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0

Q: How do I fix CVE-2025-6855?

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

Q: Is CVE-2025-6855 being exploited?

CVE-2025-6855 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-2025-6855 affect?

CVE-2025-6855 affects langchain-chatchat. Severity is medium (CVSS 5.5). A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This issue affects some unknown processing of the file /v1/file. The manipulation of the argument flag leads to path travers

Q: How urgent is CVE-2025-6855?

Priority 37/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2025-6855 is a medium-severity flaw (CVSS 5.5) affecting langchain-chatchat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This issue affects some unknown processing of the file /v1/file. The manipulation of the argument flag leads to path traversal. 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	5.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 48%)
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 09:15 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-2025-6855?

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

Is CVE-2025-6855 being exploited?

CVE-2025-6855 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-2025-6855 affect?

CVE-2025-6855 affects langchain-chatchat. Severity is medium (CVSS 5.5). A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This issue affects some unknown processing of the file /v1/file. The manipulation of the argument flag leads to path travers

How urgent is CVE-2025-6855?

Priority 37/100. Public exploit reference

Software pages

OpenAI and LLM tools vulnerabilities

Related CVEs

CVE-2025-6854 MEDIUM 4.3 UPGRADE A vulnerability classified as problematic was found in chatchat-space Langchain-Chatchat up to 0.3.1
CVE-2025-6853 MEDIUM 6.3 UPGRADE A vulnerability classified as critical has been found in chatchat-space Langchain-Chatchat up to 0.3.1

References

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