# OPENSUSE-SU-2026:21593-1: go1.26 security update

OPENSUSE-SU-2026:21593-1, released August 19, 2026, fixes 9 CVEs in go1.26 (version 1.26.6-160000.1.1). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/opensuse-su-2026-21593-1
- Platform: Linux
- Released: Aug 19, 2026
- Priority: Urgent (Closes CVE-2026-39821, rated Critical)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/openSUSE-SU-2026:21593-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [go1.26](https://patchblox.com/security/data/product/linux/go1.26.md) | opensuse-leap 16.0 | 1.26.6-160000.1.1 |

## 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-2026-33818](https://patchblox.com/security/data/cve/CVE-2026-33818.md) | High | Enforce maximum recursion depth in encoding/asn1 | 8.8 | 0.0057 |  |
| [CVE-2026-56853](https://patchblox.com/security/data/cve/CVE-2026-56853.md) | High | Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http | 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-2026-56860](https://patchblox.com/security/data/cve/CVE-2026-56860.md) | High | Avoid quadratic complexity in resolvePath in net/url | 8.8 | 0.0055 |  |
| [CVE-2026-56858](https://patchblox.com/security/data/cve/CVE-2026-56858.md) | High | Fix Javascript regexp context tracking in html/template | 8.8 | 0.0031 |  |
| [CVE-2026-56864](https://patchblox.com/security/data/cve/CVE-2026-56864.md) | High | Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb | 7.5 | 0.0030 |  |
| [CVE-2026-56865](https://patchblox.com/security/data/cve/CVE-2026-56865.md) | High | Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog | 8.4 | 0.0013 |  |

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Data as of 2026-11-09T13:31:49Z 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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