# RHSA-2026:66350: Security update for 3 packages

RHSA-2026:66350, released August 13, 2026, fixes 8 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-66350
- Platform: Linux
- Released: Aug 13, 2026
- Priority: Urgent (Closes CVE-2026-39821, rated Critical)
- CVEs: 8, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:66350

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [openshift](https://patchblox.com/security/data/product/linux/openshift.md) | RHEL 10 | 4.21.0-202609022229.p2.g93afd70.assembly.stream.el10 |
| [openshift-clients](https://patchblox.com/security/data/product/linux/openshift-clients.md) | RHEL 10 | 4.21.0-202609071555.p2.gd0bf7cc.assembly.stream.el10 |
| [ose-crio-credential-provider](https://patchblox.com/security/data/product/linux/ose-crio-credential-provider.md) | RHEL 10 | 4.21.0-202609021357.p2.g83d4961.assembly.stream.el10 |

## 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-2026-33814](https://patchblox.com/security/data/cve/CVE-2026-33814.md) | High | Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net | 7.5 | 0.0084 |  |
| [CVE-2026-33818](https://patchblox.com/security/data/cve/CVE-2026-33818.md) | High | Enforce maximum recursion depth in encoding/asn1 | 8.8 | 0.0057 |  |
| [CVE-2026-56859](https://patchblox.com/security/data/cve/CVE-2026-56859.md) | High | Add recursion depth guard during decode in encoding/xml | 8.8 | 0.0057 |  |
| [CVE-2026-56862](https://patchblox.com/security/data/cve/CVE-2026-56862.md) | High | Limit handshake messages we are willing to accept post-handshake in crypto/tls | 8.8 | 0.0057 |  |
| [CVE-2026-42504](https://patchblox.com/security/data/cve/CVE-2026-42504.md) | High | Quadratic complexity in WordDecoder.DecodeHeader in mime | 8.8 | 0.0056 |  |
| [CVE-2026-56860](https://patchblox.com/security/data/cve/CVE-2026-56860.md) | High | Avoid quadratic complexity in resolvePath in net/url | 8.8 | 0.0055 |  |
| [CVE-2026-39822](https://patchblox.com/security/data/cve/CVE-2026-39822.md) | High | Root escape via symlink plus trailing slash in os | 8.2 | 0.0023 |  |

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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

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