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MEDIUM severity

Client Denial of Service on TUFGHSA-2828-9vh6-9m6j

MEDIUM

GHSA-2828-9vh6-9m6j is a medium-severity (CVSS 5.3) Uncontrolled Resource Consumption vulnerability in tuf. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for tuf — see the affected versions and patch details below.

Also known asCVE-2020-6173PYSEC-2020-146
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs78th percentile — riskier than 78% of all scored CVEsHighest risk
0.00%0.75%1.51%2.26%0.2%1.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍tuf

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Impact

An attacker who can gain file access to the repository and modify metadata files may cause a denial of service to clients by creating many invalid signatures on a metadata file. Having a large number of signatures to verify will delay the moment when the client will determine the signature is not valid. This delay may be for at least a few minutes, but possibly could be longer especially if multiple files are impacted.

The tuf maintainers would like to thank Erik MacLean of Analog Devices, Inc. for reporting this issue.

Patches

No fix exists for this issue.

Workarounds

No workarounds are known for this issue.

References

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPItuf≥ 0.7.2&&< 0.12.20.12.2pip install --upgrade 'tuf==0.12.2'

Affected Products

1 product · 1 configurations
Application
the update frameworklinuxfoundation
≥ 0.7.2 && ≤ 0.12.1
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

TUF (aka The Update Framework) 0.7.2 through 0.12.1 allows Uncontrolled …

github.comNVDJan 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tuf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update tuf to 0.12.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2828-9vh6-9m6j is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Impact An attacker who can gain file access to the repository and modify metadata files may cause a denial of service to clients by creating many invalid signatures on a metadata file. Having a large number of signatures to verify will delay the moment when the client will determine the signature is not valid. This delay may be for at least a few minutes, but possibly could be longer especially if multiple files are impacted. The tuf maintainers would like to thank Erik MacLean of Analog Devices, Inc. for reporting this issue. ### Patches No fix exists for this issue. ### Workarounds N
O3 Security · Impact-Aware SCA

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Client Denial of Service on TUF (Medium 5.3)