# ALSA-2026:55855: Security update for 3 packages

ALSA-2026:55855, released August 17, 2026, fixes 11 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/alsa-2026-55855
- Platform: Linux
- Released: Aug 17, 2026
- Priority: High (Closes CVE-2026-59844, high severity)
- CVEs: 11, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/ALSA-2026:55855

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libssh](https://patchblox.com/security/data/product/linux/libssh.md) | almalinux 10 | 0.12.0-3.el10_2 |
| [libssh-config](https://patchblox.com/security/data/product/linux/libssh-config.md) | almalinux 10 | 0.12.0-3.el10_2 |
| [libssh-devel](https://patchblox.com/security/data/product/linux/libssh-devel.md) | almalinux 10 | 0.12.0-3.el10_2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-59843](https://patchblox.com/security/data/cve/CVE-2026-59843.md) | High | Libssh: libssh: denial of service via zero advertised channel packet size | 8.8 | 0.0057 |  |
| [CVE-2026-59844](https://patchblox.com/security/data/cve/CVE-2026-59844.md) | High | Libssh: libssh: denial of service via oversized sftp read length | 8.8 | 0.0057 |  |
| [CVE-2026-59842](https://patchblox.com/security/data/cve/CVE-2026-59842.md) | High | libssh: A flaw was found in libssh | 8.8 | 0.0049 |  |
| [CVE-2026-59851](https://patchblox.com/security/data/cve/CVE-2026-59851.md) | High | libssh: A flaw was found in libssh | 8.8 | 0.0049 |  |
| [CVE-2026-59849](https://patchblox.com/security/data/cve/CVE-2026-59849.md) | High | libssh: A flaw was found in libssh | 8.8 | 0.0044 |  |
| [CVE-2026-59850](https://patchblox.com/security/data/cve/CVE-2026-59850.md) | High | Libssh: libssh: use-after-free via data callbacks on closed channels | 8.8 | 0.0035 |  |
| [CVE-2026-59848](https://patchblox.com/security/data/cve/CVE-2026-59848.md) | High | Libssh: libssh: denial of service via sftp responses with unknown request ids | 8.8 | 0.0034 |  |
| [CVE-2026-59847](https://patchblox.com/security/data/cve/CVE-2026-59847.md) | High | Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification | 8.8 | 0.0033 |  |
| [CVE-2026-15370](https://patchblox.com/security/data/cve/CVE-2026-15370.md) | High | libssh: A flaw was found in libssh | 8.8 | 0.0017 |  |
| [CVE-2026-59846](https://patchblox.com/security/data/cve/CVE-2026-59846.md) | High | libssh: A flaw was found in libssh | 8.8 | 0.0012 |  |
| [CVE-2026-59845](https://patchblox.com/security/data/cve/CVE-2026-59845.md) | High | Libssh: libssh: denial of service via unchecked proxycommand fork() failure | 8.8 | 0.0010 |  |

---

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