CVE-2026-123806

What it is

python-tuf is a Python reference implementation of The Update Framework (TUF). Prior to 7.0.0, DelegatedRole._is_target_in_pathpattern in tuf/api/_payload.py uses fnmatch.fnmatch, which applies os.path.normcase before matching and makes delegation path authorization case-insensitive on Windows. When a TUF repository has path-based delegations that differ only by case and an attacker-controlled role is visited before the legitimate role, ngclient can accept an attacker-provided target from the wrong delegation for a requested path. Linux and macOS clients are not affected because their path normalization does not change case. This issue is fixed in 7.0.0.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. Limited direct impact.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-11-09 20:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-09 20:18 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: not scored yet.
• Severity: 4.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-11-09 20:18 UTC

Last modified

2026-11-09 20:18 UTC

Weakness

CWE-178

Record status

Received

Affected

• Theupdateframework python-tuf < 7.0.0

Attack profile CVSS 3.1 · 4.0

Attack vector

Local

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-123806.md and follow it. Check whether this project is affected by CVE-2026-123806. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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