CVE-2025-71356Public exploitNetwork attack vector

Code execution via omitted unsafe-global blocklist entry

Published Jul 4, 2026 · Updated Jul 4, 2026

Scanner bypass in picklescan before 0.0.28 allows attackers to conceal code-executing calls in malicious pickle files. The unsafe-global classifier omits torch.fx.experimental.symbolic_shapes.ShapeEnv.evaluate_guards_expression from its blocklist, so scans do not mark the callable as dangerous. Execution occurs only after a victim trusts the scan result and loads the crafted file, whose reduce method evaluates attacker-controlled Python code.

CVSS severity7.6
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Scanner bypass in picklescan before 0.0.28 allows attackers to conceal code-executing calls in malicious pickle files. The unsafe-global classifier omits torch.fx.experimental.symbolic_shapes.ShapeEnv.evaluate_guards_expression from its blocklist, so scans do not mark the callable as dangerous. Execution occurs only after a victim trusts the scan result and loads the crafted file, whose reduce method evaluates attacker-controlled Python code.

The record

CVE
CVE-2025-71356
Published
Jul 4, 2026
Updated
Jul 4, 2026
Vendor
Matthieu Maitre
Product
picklescan
Classifications
CWE-502, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 4, 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 <0.0.28

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Matthieu Maitre · picklescanversion=0 <0.0.28

Published CVSS scores

7.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
8.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A: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-502Deserialization of Untrusted Data
T1204.002Malicious 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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