# CVE-2026-54634: hamlib: Hamlib is a ham radio control library for radios, rotators, and amplifiers

CVE-2026-54634 is fixed in hamlib on 1 platform, first by OPENSUSE-SU-2026:21155-1, released June 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-54634
- Priority: High
- CVSS: 7.3 (high)
- EPSS: 0.0044
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 23, 2026

## Description

Hamlib is a ham radio control library for radios, rotators, and amplifiers. Prior to 4.7.2, the unauthenticated rigctld send_raw command on TCP port 4532 reaches rigctl_send_raw() in tests/rigctl_parse.c, which writes a NUL byte at buf[buf_len + 1] outside its 200-byte stack buffer, and rig_send_raw() in src/rig.c, which copies reply_len - 1 bytes instead of the actual nbytes received. A remote client can send the CR terminator with a short payload to trigger both flaws in one command under the default no-password configuration. The out-of-bounds write can crash the daemon or corrupt adjacent stack memory, while the oversized copy can return up to 198 bytes of uninitialized stack data to the client. This issue is fixed in version 4.7.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | hamlib Debian 14 | 4.7.2-1 | [DEBIAN-CVE-2026-54634](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54634.md) | Sep 19, 2026 |
| Linux | hamlib opensuse-leap 16.0 | 4.7.2-bp160.1.1 | [OPENSUSE-SU-2026:21155-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21155-1.md) | Jun 23, 2026 |

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Data as of 2026-11-09T07:25:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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