Deserialization in Trailofbits Fickling
CVE-2026-22606
Fickling is a Python pickling decompiler and static analyzer. Fickling versions up to and including 0.1.6 do not treat Python’s runpy module as unsafe. Because of this, a malicious pickle that uses runpy.run_path() or runpy.run_module() is classified as SUSPICIOUS instead of OVERTLY_MALICIOUS. If a user relies on Fickling’s output to decide whether a pickle is safe to deserialize, this misclassification can lead them to execute attacker-controlled code on their system. This affects any workflow or product that uses Fickling as a security gate for pickle deserialization. This issue has been patched in version 0.1.7.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Trailofbits Fickling — versions < 0.1.7
Weakness classification (CWE)
References
- github.com/trailofbits/fickling/security/advisories/GHSA-wfq2-52f7-7qvj (Exploit, Vendor Advisory)
- github.com/trailofbits/fickling/commit/9a2b3f89bd0598b528d62c10a64c1986fcb09f66 (Patch)
- github.com/trailofbits/fickling/releases/tag/v0.1.7 (Release Notes)
Frequently asked questions
- What is CVE-2026-22606?
- CVE-2026-22606 is a high-severity vulnerability in Trailofbits Fickling, classified under Incomplete List of Disallowed Inputs. CVSS score: 7.8/10. Published 2026-01-10.
- How severe is CVE-2026-22606?
- High severity. CVSS v3 base score is 7.8 out of 10.