CVE-2025-1889Public exploitNetwork attack vector

Malicious-model bypass via extension-only archive scanning

Published Mar 3, 2025 · Updated Dec 29, 2025

Security scan bypass in picklescan 0.0.1 through 0.0.21 allows remote attackers to conceal malicious Pickle payloads in model archives. The ZIP archive scanner selected embedded files only when their suffix matched a fixed pickle-extension set, ignoring Pickle content under other names. Exploitation requires a recipient or automated process to trust and load a model that passed scanning, at which point the hidden payload executes.

CVSS severity5.3
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Security scan bypass in picklescan 0.0.1 through 0.0.21 allows remote attackers to conceal malicious Pickle payloads in model archives. The ZIP archive scanner selected embedded files only when their suffix matched a fixed pickle-extension set, ignoring Pickle content under other names. Exploitation requires a recipient or automated process to trust and load a model that passed scanning, at which point the hidden payload executes.

The record

CVE
CVE-2025-1889
Published
Mar 3, 2025
Updated
Dec 29, 2025
Vendor
Matthieu Maitre
Product
picklescan
Classifications
CWE-646, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 29, 2025Record 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=0.0.1 <=0.0.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Matthieu Maitre · picklescanversion=0.0.1 <=0.0.21

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.3SonatypeCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-646Reliance on File Name or Extension of Externally-Supplied File
T1204.002User Execution: Malicious File

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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