# OPENSUSE-SU-2026:21878-1: ruby3.4 security update

OPENSUSE-SU-2026:21878-1, released September 18, 2026, fixes 8 CVEs in ruby3.4 (version 3.4.10-160000.1.1). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/opensuse-su-2026-21878-1
- Platform: Linux
- Released: Sep 18, 2026
- Priority: High (Closes CVE-2026-41316, high severity)
- CVEs: 8, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/openSUSE-SU-2026:21878-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [ruby3.4](https://patchblox.com/security/data/product/linux/ruby3.4.md) | opensuse-leap 16.0 | 3.4.10-160000.1.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-41316](https://patchblox.com/security/data/cve/CVE-2026-41316.md) | High | ruby2.5: erb: @_init deserialization guard bypass via def_module / def_method / def_class (bsc#1262441). | 9.1 | 0.0113 |  |
| [CVE-2026-47240](https://patchblox.com/security/data/cve/CVE-2026-47240.md) | High | Net::IMAP: Command Injection via non-synchronizing literal in "raw" argument | 7.3 | 0.0083 |  |
| [CVE-2026-42258](https://patchblox.com/security/data/cve/CVE-2026-42258.md) | High | net-imap: Command Injection via unvalidated Symbol inputs | 7.4 | 0.0078 |  |
| [CVE-2026-27820](https://patchblox.com/security/data/cve/CVE-2026-27820.md) | High | zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption | 9.8 | 0.0056 |  |
| [CVE-2025-61594](https://patchblox.com/security/data/cve/CVE-2025-61594.md) | High | ruby3.4: merging URIs using the + operator could expose sensitive user credentials (bsc#1270034). | 7.5 | 0.0056 |  |
| [CVE-2026-47241](https://patchblox.com/security/data/cve/CVE-2026-47241.md) | High | Net::IMAP: Denial of Service via incomplete raw argument validation | 7.3 | 0.0038 |  |
| [CVE-2025-58767](https://patchblox.com/security/data/cve/CVE-2025-58767.md) | High | REXML has a DoS condition when parsing malformed XML file | 7.5 | 0.0025 |  |
| [CVE-2026-47242](https://patchblox.com/security/data/cve/CVE-2026-47242.md) | High | ruby: Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby | 7.3 | 0.0018 |  |

---

Data as of 2026-11-11T01:43:54Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo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.