# RHSA-2026:34359: opentelemetry-collector security update

RHSA-2026:34359, released July 2, 2026, fixes 6 CVEs in opentelemetry-collector (version 0:0.152.1-1.el9_8). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-34359
- Platform: Linux
- Released: Jul 2, 2026
- Priority: Urgent (Closes CVE-2026-39821, rated Critical)
- CVEs: 6, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:34359

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [opentelemetry-collector](https://patchblox.com/security/data/product/linux/opentelemetry-collector.md) | RHEL 9 | 0:0.152.1-1.el9_8 |

## 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-2026-42154](https://patchblox.com/security/data/cve/CVE-2026-42154.md) | High | Prometheus: remote read endpoint allows denial of service via crafted snappy payload | 8.2 | 0.0081 |  |
| [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 |  |
| [CVE-2026-42151](https://patchblox.com/security/data/cve/CVE-2026-42151.md) | High | Prometheus Azure AD remote write OAuth client secret exposed via config API | 8.2 | 0.0035 |  |
| [CVE-2026-25681](https://patchblox.com/security/data/cve/CVE-2026-25681.md) | High | Invoking  incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html | 8.7 | 0.0022 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo