Vulnerability · Published Jan 10, 2026 · Assigned by GitHub_M
CVE-2026-22609Fickling has Static Analysis Bypass via Incomplete Dangerous Module Blocklist
High 8.9
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 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | fickling | 0.1.7 | GHSA-q5qq-mvfm-j35x |
| PyPI | fickling | 0.1.7 | PYSEC-2026-1372 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| trailofbits | fickling | < 0.1.7 |
Weakness: CWE-184, CWE-502 · Vector: 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
References
- https://github.com/trailofbits/fickling/security/advisories/GHSA-q5qq-mvfm-j35x x_refsource_CONFIRM
- https://github.com/trailofbits/fickling/commit/29d5545e74b07766892c1f0461b801afccee4f91 x_refsource_MISC
- https://github.com/trailofbits/fickling/commit/9a2b3f89bd0598b528d62c10a64c1986fcb09f66 x_refsource_MISC
- https://github.com/trailofbits/fickling/commit/b793563e60a5e039c5837b09d7f4f6b92e6040d1 x_refsource_MISC
- https://github.com/trailofbits/fickling/commit/eb299b453342f1931c787bcb3bc33f3a03a173f9 x_refsource_MISC
- https://github.com/trailofbits/fickling/releases/tag/v0.1.7 x_refsource_MISC