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.
CVE-2026-54634
HIGHPre-NVD 7.37.3—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.3
- EG Score
- 7.3(medium)
- EG Risk
- 48(Track)EG Risk 48/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity73% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 17%
- KEV
- Not listed
Published
September 17, 2026
Last Modified
September 18, 2026
Advisory Details (6)
Auto-updated Sep 17, 2026🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available
Hamlib 4.7.2
Patch available: Hamlib/Hamlib 4.7.2
https://github.com/Hamlib/Hamlib/releases/tag/4.7.2github_commit
commit a3a7f00d759e (Hamlib/Hamlib)
Fix landed in Hamlib/Hamlib commit a3a7f00d759e — awaiting tagged release
https://github.com/Hamlib/Hamlib/commit/a3a7f00d759edadbe195d112dc89006ae8db146egithub_commit
commit 587f7bb2c644 (Hamlib/Hamlib)
Fix landed in Hamlib/Hamlib commit 587f7bb2c644 — awaiting tagged release
https://github.com/Hamlib/Hamlib/commit/587f7bb2c6442e36ed5b6021f6ee9951daf1576bgithub_commit
commit 47171005bf04 (Hamlib/Hamlib)
Fix landed in Hamlib/Hamlib commit 47171005bf04 — awaiting tagged release
https://github.com/Hamlib/Hamlib/commit/47171005bf041f520bb134edf796b9f6fc27e6bfgithub_commit
commit 3e3f78fc7732 (Hamlib/Hamlib)
Fix landed in Hamlib/Hamlib commit 3e3f78fc7732 — awaiting tagged release
https://github.com/Hamlib/Hamlib/commit/3e3f78fc7732a4ce0da97b7a86d6d9fd9bd117c4github Patch Available🟡 PoC Available
rigctld `send_raw` Stack Out-of-Bounds Write and Uninitialized Memory Disclosure · Advisory · Hamlib/Hamlib · GitHub
https://github.com/Hamlib/Hamlib/security/advisories/GHSA-gpcq-c37x-pr46Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-19 02:37 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-18 15:23 UTCEG score recompute
- 2026-09-18 14:54 UTCEG score recompute
- 2026-09-17 22:24 UTCEG score recompute
- 2026-09-17 21:59 UTCEG score recompute
- 2026-09-17 21:59 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-54634?
CVE-2026-54634 is a high vulnerability published on September 17, 2026. Hamlib is a ham radio control library for radios, rotators, and amplifiers. Prior to 4.7.2, the unauthenticated rigctld sendraw command on TCP port 4532 reaches rigctlsendraw() in tests/rigctlparse.c, which writes a NUL byte at buf[buflen + 1] outside its 200-byte stack buffer, and rigsendraw() in…
When was CVE-2026-54634 disclosed?
CVE-2026-54634 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54634 actively exploited?
CVE-2026-54634 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.2% of all scored CVEs.
What is the CVSS score of CVE-2026-54634?
CVE-2026-54634 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-54634?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54634, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-54634
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