# ELSA-2026-33540: Security update for 5 packages

ELSA-2026-33540, released July 16, 2026, fixes 3 CVEs across 5 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2026-33540
- Platform: Linux
- Released: Jul 16, 2026
- Priority: High (Closes CVE-2026-42258, high severity)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2026-33540.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [ruby4.0](https://patchblox.com/security/data/product/linux/ruby4.0.md) | ol 10 | 0:4.0.3-35.el10_2 |
| [ruby4.0-devel](https://patchblox.com/security/data/product/linux/ruby4.0-devel.md) | ol 10 | 0:4.0.3-35.el10_2 |
| [ruby4.0-doc](https://patchblox.com/security/data/product/linux/ruby4.0-doc.md) | ol 10 | 0:4.0.3-35.el10_2 |
| [ruby4.0-rubygem-mysql2](https://patchblox.com/security/data/product/linux/ruby4.0-rubygem-mysql2.md) | ol 10 | 0:0.5.7-35.el10_2 |
| [ruby4.0-rubygem-pg](https://patchblox.com/security/data/product/linux/ruby4.0-rubygem-pg.md) | ol 10 | 0:1.6.3-35.el10_2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [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-2026-42245](https://patchblox.com/security/data/cve/CVE-2026-42245.md) | High | ruby4.0: Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby | 7.4 | 0.0041 |  |
| [CVE-2026-42246](https://patchblox.com/security/data/cve/CVE-2026-42246.md) | High | net-imap vulnerable to STARTTLS stripping via invalid response timing | 7.4 | 0.0031 |  |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo