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CVE-2026-123806

python-tuf: Platform-dependent delegation path matching

No exploitation reported by the sources we read.

  • Published2026-11-09
  • Fixed in7.0.0
  • WeaknessCWE-178

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-11-0920:18CVE publishedCNA

Versions per branch

OSV
tuf
BranchAffectedFixed in
7.0< 7.0.07.0.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • theupdateframework python-tuf
    Affected
    • = < 7.0.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-09

Fix

  1. Update tuf to 7.0.0

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-09
  • CNACVSS 3.142026-11-09
  • CNAweakness (CWE)CWE-1782026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-05-28

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
2026-11-09
GitHub Advisory
GHSA-qp9x-wp8f-qgjj

Frequently asked questions

What is CVE-2026-123806?

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.

Is CVE-2026-123806 actively exploited?

Active exploitation of CVE-2026-123806 has not been confirmed.

What is the CVSS score for CVE-2026-123806?

CVE-2026-123806 has a CVSS v3 base score of 4 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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