CVE-2025-10156Public exploitNetwork attack vector

Security scan bypass via enforced ZIP CRC

Published Sep 17, 2025 · Updated Sep 17, 2025

Improper exception handling in picklescan 0.0.30 and earlier allows remote attackers to bypass ZIP archive security scans. RelaxedZipFile leaves Python zipfile CRC validation enabled, so a mismatched CRC raises an exception and stops scan_zip_bytes before embedded pickle files are analyzed. The bypass requires a crafted ZIP archive; code execution follows only if a downstream application loads an unscanned malicious pickle despite the CRC error.

CVSS severity9.3
Critical
EPSS probability1.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exception handling in picklescan 0.0.30 and earlier allows remote attackers to bypass ZIP archive security scans. RelaxedZipFile leaves Python zipfile CRC validation enabled, so a mismatched CRC raises an exception and stops scan_zip_bytes before embedded pickle files are analyzed. The bypass requires a crafted ZIP archive; code execution follows only if a downstream application loads an unscanned malicious pickle despite the CRC error.

The record

CVE
CVE-2025-10156
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
Matthieu Maitre
Product
picklescan
Classifications
CWE-693, CWE-755
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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 <=0.0.30 changes=[{"at":"0.0.31","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Matthieu Maitre · picklescanversion=0 <=0.0.30 changes=[{"at":"0.0.31","status":"unaffected"}]

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.3JFrogCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CWE-755Improper Handling of Exceptional Conditions

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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