Vulnerability · Published Dec 16, 2025 · Assigned by GitHub_M

CVE-2025-67748Fickling has Code Injection vulnerability via pty.spawn()

High 7.1

In plain English

A high-severity unsafe deserialization in fickling from trailofbits. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.3%top 80.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	fickling	0.1.6	GHSA-r7v6-mfhq-g3m2
PyPI	fickling	0.1.6	PYSEC-2025-113

Affected products (as reported)

Vendor	Product	Versions
trailofbits	fickling	< 0.1.6

Weakness: CWE-184, CWE-502, CWE-94 · Vector: CVSS: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

References

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