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PatchSiren cyber security CVE debrief

CVE-2026-53874 picklescan CVE debrief

CVE-2026-53874 is a critical vulnerability in picklescan before 1.0.1, allowing unauthenticated users to execute arbitrary code by hiding eval calls nested under callable objects via getattr. Attackers can embed malicious code in pickle files that evades detection but executes when the pickle is loaded from untrusted sources. This vulnerability has a CVSS score of 9.3 and is classified as CRITICAL. Affected users and administrators should be aware of this vulnerability and take immediate action to upgrade to a patched version or apply compensating controls.

Vendor
picklescan
Product
Unknown
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-23
Advisory published
2026-06-17
Advisory updated
2026-06-23

Who should care

Users and administrators of picklescan before version 1.0.1 should be aware of this vulnerability and take immediate action to upgrade to a patched version or apply compensating controls. This includes operators, platform administrators, vulnerability management teams, and security teams who may be impacted by this vulnerability.

Technical summary

The vulnerability is caused by an unsafe deserialization issue in picklescan before 1.0.1. This allows attackers to execute arbitrary code by embedding malicious code in pickle files. The vulnerability has a CVSS score of 9.3 and is classified as CRITICAL. Users should review official advisories and take immediate action to mitigate this vulnerability. Affected product deployments should be identified and verified for exposure, with compensating controls implemented where necessary. Security teams should track exceptions, retest remediated assets, and review relevant monitoring, detection, and logs for exposed assets that need extra review.

Defensive priority

High

Recommended defensive actions

  • Upgrade picklescan to version 1.0.1 or later
  • Implement compensating controls such as validating and sanitizing pickle files
  • Monitor for suspicious activity and implement logging and auditing
  • Review 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
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record was published on 2026-06-17T17:17:25.733Z and was last modified on 2026-06-23T03:16:41.477Z. The NVD entry is currently Deferred. Evidence is limited to public sources and may not reflect the full scope or impact of this vulnerability. Defenders should verify affected systems and review official advisories for specific guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53874 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53874

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

  • CVE-2026-53874 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53874

    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.