Hamlib up to 4.7.1 Send Raw Command tests/rigctl_parse.c rigctl_send_raw/rig_send_raw out-of-bounds write

Summaryinfo

A vulnerability was found in Hamlib up to 4.7.1. It has been classified as critical. Affected by this issue is the function rigctl_send_raw/rig_send_raw of the file tests/rigctl_parse.c of the component Send Raw Command. Performing a manipulation results in out-of-bounds write. This vulnerability is known as CVE-2026-54634. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Hamlib up to 4.7.1. It has been classified as critical. This affects the function rigctl_send_raw/rig_send_raw of the file tests/rigctl_parse.c of the component Send Raw Command. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-54634 since 06/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 4.7.2 eliminates this vulnerability.

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Productinfo

Name

• Hamlib

Version

• 4.7.0
• 4.7.1

Website

• Product: https://github.com/Hamlib/Hamlib/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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