# CVE-2018-16396: libruby2.5: An issue was discovered in Ruby before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.2, and 2.6.x before 2.6.0-preview3

CVE-2018-16396 is fixed in 2 products on 1 platform, first by libruby2.5 2.5.1-1ubuntu1.1, released October 25, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-16396
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0797
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 25, 2018

## Description

An issue was discovered in Ruby before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.2, and 2.6.x before 2.6.0-preview3. It does not taint strings that result from unpacking tainted strings with some formats.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libruby2.5 Ubuntu 18.04.6 LTS (bionic) | 2.5.1-1ubuntu1.1 | [libruby2.5 2.5.1-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libruby2.5-2.5.1-1ubuntu1.1.md) | Oct 25, 2018 |
| Linux | ruby2.5 Ubuntu 18.04.6 LTS (bionic) | 2.5.1-1ubuntu1.1 | [ruby2.5 2.5.1-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ruby2.5-2.5.1-1ubuntu1.1.md) | Oct 25, 2018 |

---

Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.