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MEDIUM severity

Upsonic is vulnerable to Path Traversal attack through its os.path.join functionGHSA-8jf4-fcjr-68c2

MEDIUMFix: Upsonic/Upsonic#360

GHSA-8jf4-fcjr-68c2 is a medium-severity (CVSS 5.5) Path Traversal vulnerability in upsonic. A fix is available for upsonic — see the affected versions and patch details below.

Also known asCVE-2025-6278PYSEC-2025-67
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for GHSA-8jf4-fcjr-68c2.

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk-0.08%
Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk
0.13%0.52%0.90%1.29%0.6%0.7%May 26Aug 26Oct 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
🐍upsonic

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

A vulnerability classified as critical was found in Upsonic up to 0.55.6. This vulnerability affects the function os.path.join of the file markdown/server.py. The manipulation of the argument file.filename leads to path traversal. The exploit has been disclosed to the public and may be used.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIupsonicall versions0.56.0pip install --upgrade 'upsonic==0.56.0'

Affected Products

1 product · 1 configurations
Application
upsonicupsonic
≤ 0.55.6
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update upsonic to 0.56.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8jf4-fcjr-68c2 is resolved across your whole dependency graph.

  3. Workarounds

    Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

A vulnerability classified as critical was found in Upsonic up to 0.55.6. This vulnerability affects the function os.path.join of the file markdown/server.py. The manipulation of the argument file.filename leads to path traversal. The exploit has been disclosed to the public and may be used.
O3 Security · Impact-Aware SCA

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Upsonic is vulnerable to Path Traversal attack through its…