Vulnerability in Chatchat-Space Langchain-Chatchat
CVE-2026-7845
A flaw has been found in chatchat-space Langchain-Chatchat up to 0.3.1.3. This issue affects the function PIL.Image.tobytes of the file libs/chatchat-server/chatchat/webui_pages/dialogue/dialogue.py of the component Vision Chat Paste Image Handler. This manipulation of the argument paste_image.image_data causes use of weak hash. The attacker needs to be present on the local network. The attack is considered to have high complexity. The exploitability is assessed as difficult. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.6 (Low). Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- Chatchat-Space Langchain-Chatchat — versions 0.3.1.0, 0.3.1.1, 0.3.1.2
Weakness classification (CWE)
References
- github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-1-tobytes-Hash-Colli… (exploit)
- github.com/chatchat-space/Langchain-Chatchat/ (product)
- github.com/chatchat-space/Langchain-Chatchat/issues/5462 (issue-tracking)
- vuldb.com/submit/807794 (third-party-advisory)
- vuldb.com/vuln/361124 (technical-description, vdb-entry)
- vuldb.com/vuln/361124/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-7845?
- CVE-2026-7845 is a low-severity vulnerability in Chatchat-Space Langchain-Chatchat, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 2.6/10. Published 2026-05-05.
- How severe is CVE-2026-7845?
- Low severity. CVSS v3 base score is 2.6 out of 10.