Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/Hamlib/Hamlib/commit/3e3f78fc7732a4ce0da97b7a86d6d9fd9bd117c4
- https://github.com/Hamlib/Hamlib/commit/47171005bf041f520bb134edf796b9f6fc27e6bf
- https://github.com/Hamlib/Hamlib/commit/587f7bb2c6442e36ed5b6021f6ee9951daf1576b
- https://github.com/Hamlib/Hamlib/commit/a3a7f00d759edadbe195d112dc89006ae8db146e
- https://github.com/Hamlib/Hamlib/releases/tag/4.7.2
- https://github.com/Hamlib/Hamlib/security/advisories/GHSA-gpcq-c37x-pr46
FAQ
What is CVE-2026-54634?
CVE-2026-54634 is a vulnerability with a CVSS score of 7.3 (HIGH). 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_pars...
How severe is CVE-2026-54634?
CVE-2026-54634 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54634?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.