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Vulnerability record · CVE-2026-22609 · published 10 January 2026

CVE-2026-22609: Trailofbits fickling deserialization of untrusted data vulnerability

Trailofbits · Fickling

Fickling is a Python pickling decompiler and static analyzer. Prior to version 0.1.7, the unsafe_imports() method in Fickling's static analyzer fails to flag several high-risk Python modules that can be used for arbitrary code execution. Malicious pickles importing these modules will not be detected as unsafe, allowing attackers to bypass Fickling's primary static safety checks. This issue has been patched in version 0.1.7.

8.9 CVSS 4.0 High EPSS 0.64% · top 51.5% CWE-184 · CWE-184CWE-502 · Deserialization of untrusted data
8.9CVSS 4.0 base score
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Fickling is a Python pickling decompiler and static analyzer. Prior to version 0.1.7, the unsafe_imports() method in Fickling's static analyzer fails to flag several high-risk Python modules that can be used for arbitrary code execution. Malicious pickles importing these modules will not be detected as unsafe, allowing attackers to bypass Fickling's primary static safety checks. This issue has been patched in version 0.1.7.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/trailofbits/fickling/commit/29d5545e74b07766892c1f0461b801afccee4f91 Patch
https://github.com/trailofbits/fickling/commit/9a2b3f89bd0598b528d62c10a64c1986fcb09f66 Patch
https://github.com/trailofbits/fickling/commit/b793563e60a5e039c5837b09d7f4f6b92e6040d1 Patch
https://github.com/trailofbits/fickling/commit/eb299b453342f1931c787bcb3bc33f3a03a173f9 Patch
https://github.com/trailofbits/fickling/releases/tag/v0.1.7 Release Notes
https://github.com/trailofbits/fickling/security/advisories/GHSA-q5qq-mvfm-j35x ExploitVendor Advisory
https://github.com/trailofbits/fickling/security/advisories/GHSA-q5qq-mvfm-j35x ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-22609), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.