TI-2026-06903 Aliases CVE-2026-7845 GHSA-wmvv-fhm6-w34x

chatchat-space Langchain-Chatchat Vision Chat Paste Image dialogue.py PIL.Image.tobytes weak hash

MEDIUM 44CWE-327Published 2026-05-05 · Updated 2026-05-05

Key facts

Attack vector: Adjacent network
Privileges required: Low
User interaction: None
Attack complexity: High
Attack requirements: None
Impact type: Information disclosure
Confidentiality · integrity · availability: None · Low · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-327.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0014 3rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
chatchat-space	Langchain-Chatchat	0.3.1.0; 0.3.1.1; 0.3.1.2; 0.3.1.3	—	No fix listed	CNA
—	langchain-chatchat (PyPI)	up to 0.3.1.3	—	No fix listed	GHSA-wmvv-fhm6-w34x

Langchain-Chatchat Vendorchatchat-space Affected 0.3.1.0; 0.3.1.1; 0.3.1.2; 0.3.1.3 Fixed in — No fix listed CNA
langchain-chatchat (PyPI) Vendor— Affected up to 0.3.1.3 Fixed in — No fix listed GHSA-wmvv-fhm6-w34x

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:chatchat-space:langchain-chatchat::::::::	—	—	chatchat-space

cpe:2.3:a:chatchat-space:langchain-chatchat:*:*:*:*:*:*:*:* Versions — — ·chatchat-space

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-7845
2026-10-03 Alias added: GHSA-wmvv-fhm6-w34x

References

Exploit 1

https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-1-tobytes-Hash-Collision.md

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-7845

Other 3

TI-2026-76659 Missing authentication in Langchain-Chatchat lets attackers run commands CVSS 4.0CRITICAL 9.3
TI-2026-06902 chatchat-space Langchain-Chatchat Compatible File Service openai_routes.py delete_file missing authentication CVSS 4.0MEDIUM 5.3
TI-2025-06227 chatchat-space Langchain-Chatchat files path traversal CVSS 4.0MEDIUM 5.3
TI-2025-06226 chatchat-space Langchain-Chatchat Backend upload_temp_docs path traversal CVSS 4.0MEDIUM 5.3
TI-2025-06228 chatchat-space Langchain-Chatchat file path traversal CVSS 4.0MEDIUM 5.1
TI-2026-06905 chatchat-space Langchain-Chatchat Uploaded File openai_routes.py _get_file_id random values CVSS 4.0LOW 2.1

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences