CVE-2025-71376
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedpicklescan before 0.0.29 fails to detect malicious pickle files using idlelib.autocomplete.AutoComplete.fetch_completions in reduce methods. Attackers can embed undetected code in pickle files that executes arbitrary commands when loaded by victims.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidencepicklescan before version 0.0.29 fails to detect malicious pickle files when attackers embed code using idlelib.autocomplete.AutoComplete.fetch_completions within reduce methods. This scanner bypass allows attackers to craft pickle files containing arbitrary code that executes when loaded by victim applications.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check picklescan installed versionRun `pip show picklescan` or `pip list | grep picklescan` to retrieve the installed version numberAffected if Version is lower than 0.0.29 or version cannot be determined (package not installed)
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Verify pickle file scanning workflowIdentify whether your application or CI/CD pipeline uses picklescan to validate pickle files from untrusted or external sourcesAffected if Picklescan is used as a security control to filter untrusted pickle files and the installed version is below 0.0.29
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Inspect pickle files for idlelib.autocomplete patternExamine the raw bytes or disassemble suspicious pickle files using `pickle` module or `pickletools` to look for strings containing 'idlelib.autocomplete.AutoComplete.fetch_completions' within __reduce__ or __reduce_ex__ method definitionsAffected if A pickle file intended for untrusted input contains the idlelib.autocomplete.AutoComplete.fetch_completions pattern within reduce methods
You are affected if picklescan version is below 0.0.29 AND you use picklescan to validate pickle files from untrusted sources.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade picklescan to version 0.0.29 or later to resolve the detection gap. Until then, avoid loading untrusted pickle files from unknown sources regardless of scanner results.
picklescan 0.0.29
- Check the current version of picklescan installed (pip show picklescan or pip list)
- Upgrade to version 0.0.29 or later using pip install picklescan>=0.0.29
- Verify the upgrade was successful by running picklescan --version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-71376 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-71376 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data