PT-2026-37082 · Unknown · Langchain-Chatchat

Dem00 · Published 2026-05-05 · Updated 2026-05-05 · CVE-2026-7845

Positive Technologies (AI Summary)

CVSS v3.1

2.6

Low

Base vector

AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Langchain-Chatchat versions prior to 0.3.1.4

Description A flaw in the Vision Chat Paste Image Handler component allows for the use of a weak hash. This occurs during the manipulation of the paste image.image data argument within the PIL.Image.tobytes() function located in the libs/chatchat-server/chatchat/webui pages/dialogue/dialogue.py file. Exploitation requires the attacker to be present on the local network and is characterized by high complexity.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability. As a temporary workaround, restrict access to the PIL.Image.tobytes() function or the Vision Chat Paste Image Handler component to minimize the risk of exploitation.

Exploit

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-328

CWE-327

Related Identifiers

CVE-2026-7845

GHSA-WMVV-FHM6-W34X

Affected Products

Langchain-Chatchat

References · 10

• 🔥 https://github.com/chatchat-space/Langchain-Chatchat/issues/5462 · Exploit
• 🔥 https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-1-tobytes-Hash-Collision.md · Exploit
• https://osv.dev/vulnerability/GHSA-wmvv-fhm6-w34x · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7845 · Security Note
• https://github.com/chatchat-space/Langchain-Chatchat · Note
• https://t.me/cveNotify/162235 · Telegram Post
• https://vuldb.com/vuln/361124 · Note
• https://vuldb.com/submit/807794 · Note
• https://t.me/CVEtracker/52765 · Telegram Post
• https://vuldb.com/vuln/361124/cti · Note