# RHSA-2026:51187: yggdrasil security update

RHSA-2026:51187, released June 2, 2026, fixes 3 CVEs in yggdrasil (version 0.4.7-5.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-51187
- Platform: Linux
- Released: Jun 2, 2026
- Priority: Urgent (Closes CVE-2026-39821, rated Critical)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:51187

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [yggdrasil](https://patchblox.com/security/data/product/linux/yggdrasil.md) | RHEL 10 | 0.4.7-5.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-39821](https://patchblox.com/security/data/cve/CVE-2026-39821.md) | Urgent | Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna | 10.0 | 0.0183 |  |
| [CVE-2026-33811](https://patchblox.com/security/data/cve/CVE-2026-33811.md) | High | Crash when handling long CNAME response in net | 8.8 | 0.0088 |  |
| [CVE-2026-27145](https://patchblox.com/security/data/cve/CVE-2026-27145.md) | High | Inefficient candidate hostname parsing in crypto/x509 | 8.2 | 0.0059 |  |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo