CVE-2026-14534: Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules

This month

HIGH 8.8UPGRADE

CVE-2026-14534 is a high-severity flaw (CVSS 8.8) affecting fickling. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling's check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-184, CWE-502
Published	2026-07-04
Last modified	2026-10-25

Publisher (CNA): BombadilSystems · Vendor: trailofbits

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-04 14:16 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

trailofbits fickling UPGRADE

Affected: <= 0.1.10

Fixed in: newer than 0.1.10

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show fickling

2. UPGRADE to newer than 0.1.10

pip install --upgrade "fickling>0.1.10"

Exact fixes by distribution

Fedora ELN · nginx-mod-headers-more · FIXED · 0.41-1.eln159 · FEDORA-2026-31f55f396a · source

sudo dnf upgrade --advisory=FEDORA-2026-31f55f396a

Fedora 46 · erlang-hex_core · FIXED · 0.21.1-1.fc46 · FEDORA-2026-f3389199ff · source

sudo dnf upgrade --advisory=FEDORA-2026-f3389199ff

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/trailofbits/fickling/security/advisories/GHSA-m6fh-58r7-x697

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-14534?

fickling: upgrade to newer than 0.1.10. Exact commands for each OS are on this page.

Is CVE-2026-14534 being exploited?

CVE-2026-14534 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-14534 affect?

CVE-2026-14534 affects fickling. Severity is high (CVSS 8.8). Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist,

How urgent is CVE-2026-14534?

Priority 48/100. High severity; Public exploit reference

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-14535 HIGH 8.8 UPGRADE In Trail of Bits fickling versions up to and including 0.1.11, the UnsafeImportsML analysis pass unconditional

References

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