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PatchSiren cyber security CVE debrief

CVE-2025-71325 picklescan CVE debrief

CVE-2025-71325 picklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning. This vulnerability has a CVSS score of 9.3 and is considered CRITICAL.

Vendor
picklescan
Product
Unknown
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-09-30
Advisory published
2026-06-17
Advisory updated
2026-09-30

Who should care

Users of picklescan before version 0.0.27 should update to the latest version to mitigate this vulnerability. Affected operators include those using picklescan in their environments. Platform impact includes potential for malicious pickle files to bypass detection. Vulnerability management and security teams should review and validate pickle files before processing.

Technical summary

The picklescan library before version 0.0.27 has a parsing logic error in the _list_globals function. This error occurs when handling STACK_GLOBAL opcodes, where the library fails to properly track arguments within the correct range. As a result, maliciously crafted pickle files can bypass detection by the library. An attacker can exploit this vulnerability by creating pickle files with arguments at position zero, which can trigger unexpected exceptions and evade security scanning mechanisms.

Defensive priority

High

Recommended defensive actions

  • Update picklescan to version 0.0.27 or later
  • Review and validate pickle files before processing
  • Implement additional security measures to detect and prevent malicious pickle files
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-06-17T17:16:41.247Z and has not been modified since then. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify affected product deployments, review official advisories, and track exceptions.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-71325 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-71325

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-71325 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-71325

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.