CVE-2025-67748

Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 had a bypass caused by `pty` missing from the block list of unsafe module imports. This led to unsafe pickles based on `pty.spawn()` being incorrectly flagged as `LIKELY_SAFE`, and was fixed in version 0.1.6. This impacted any user or system that used Fickling to vet pickle files for security issues.

CVSS 4.0

7.1CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-25)

CWEs

CWE-94, CWE-184, CWE-502

Published

2025-12-16

Modified

2026-10-07

Record from

the NVD, synced 2026-10-19

Affected

• trailofbits:fickling

Packages (OSV)

References

• https://github.com/trailofbits/fickling/pull/108
• https://github.com/trailofbits/fickling/pull/187
• https://github.com/trailofbits/fickling/security/advisories/GHSA-r7v6-mfhq-g3m2

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