CVE-2026-7845Public exploit

Image replacement via metadata-blind content hashing

Published May 5, 2026 · Updated May 5, 2026

Weak image hashing in Chatchat-Space Langchain-Chatchat 0.3.1.0 through 0.3.1.3 allows remote authenticated users to overwrite images. The vision-chat handler hashes only PIL pixel or palette-index bytes with MD5, omitting PNG palette metadata, and uses that digest as the server-side filename without collision handling. In a shared instance, a user can submit a different P-mode image with the same index bytes to replace another user's stored image, causing the vision model to analyze attacker-selected content.

CVSS severity2.6
Low
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak image hashing in Chatchat-Space Langchain-Chatchat 0.3.1.0 through 0.3.1.3 allows remote authenticated users to overwrite images. The vision-chat handler hashes only PIL pixel or palette-index bytes with MD5, omitting PNG palette metadata, and uses that digest as the server-side filename without collision handling. In a shared instance, a user can submit a different P-mode image with the same index bytes to replace another user's stored image, causing the vision model to analyze attacker-selected content.

The record

CVE
CVE-2026-7845
Published
May 5, 2026
Updated
May 5, 2026
Vendor
Chatchat-Space
Product
Langchain-Chatchat
Classifications
CWE-328, CWE-327, T1565.001
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.3.1.0
  2. Affected versionversion=0.3.1.1
  3. Affected versionversion=0.3.1.2
  4. Affected versionversion=0.3.1.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Chatchat-Space · Langchain-Chatchatversion=0.3.1.0; version=0.3.1.1; version=0.3.1.2; version=0.3.1.3

Published CVSS scores

1.4VulDBAV:A/AC:H/Au:S/C:N/I:P/A:N
2.6VulDBCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
1.2VulDBCVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-328Use of Weak Hash
CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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