How severe is CVE-2025-67747?

CVE-2025-67747 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-67747 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-67747?

CVE-2025-67747 affects Trailofbits Fickling. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-67747?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-67747 have an EU (EUVD) identifier?

Yes. CVE-2025-67747 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203479.

When was CVE-2025-67747 published?

CVE-2025-67747 was published on 2025-12-16 and last updated on 2026-06-17.

CVE-2025-67747

CVE-2025-67747 is a high-severity vulnerability in Trailofbits Fickling with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-184.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 7.1
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203479
Weakness: CWE-184
Affected product: Trailofbits Fickling
Published: 2025-12-16
Last modified: 2026-06-17

Description

Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 are missing `marshal` and `types` from the block list of unsafe module imports. Fickling started blocking both modules to address this issue. This allows an attacker to craft a malicious pickle file that can bypass fickling since it misses detections for `types.FunctionType` and `marshal.loads`. A user who deserializes such a file, believing it to be safe, would inadvertently execute arbitrary code on their system. This impacts any user or system that uses Fickling to vet pickle files for security issues. The issue was fixed in version 0.1.6.

Frequently asked questions

What is CVE-2025-67747?: Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 are missing `marshal` and `types` from the block list of unsafe module imports. Fickling started blocking both modules to address this issue. This allows an attacker to craft a malicious pickle file that can bypass fickling since it misses detections for `types.FunctionType` and `marshal.loads`. A user who deserializes such a file, believing it to be safe, would inadvertently execute arbitrary code on their system. This impacts any user or system that uses Fickling to vet pickle files for security issues. The issue was fixed in version 0.1.6.
How severe is CVE-2025-67747?: CVE-2025-67747 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-67747 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-67747?: CVE-2025-67747 affects Trailofbits Fickling. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-67747?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-67747 have an EU (EUVD) identifier?: Yes. CVE-2025-67747 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203479.
When was CVE-2025-67747 published?: CVE-2025-67747 was published on 2025-12-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:trailofbits:fickling:*:*:*:*:*:*:*:*

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