{"id":"CVE-2026-122992","kind":"vulnerability","aliases":["CVE-2026-122992"],"related":[],"title":"DStarGateway: integer underflow in APRS callsign parsing from empty field","description":"In G4KLX DStarGateway and F4FXL DStarGateway before 7b75de6, dstarCallsignToAPRS in APRSUtils.cpp has an integer underflow via an empty RS-MS1A sender field.","summary":"DStarGateway, a D-STAR amateur radio gateway, has an integer underflow in dstarCallsignToAPRS when the RS-MS1A sender field is empty. The sources do not state what an attacker can achieve beyond the memory corruption this implies.","severity":"critical","cvss":9.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["amateur-radio","d-star","dstargateway","package"],"not_affected_if":["unknown"],"how_to_check":"- Check whether DStarGateway from G4KLX or F4FXL is installed, and its version, against the fixed commit `7b75de6`\n- Look for the RS-MS1A sender handling in APRSUtils.cpp","fix":"- Move to a DStarGateway build that includes commit `7b75de6`","status":"open","published_at":"2026-11-05T03:17:25+00:00","first_seen_at":"2026-11-05T03:31:42+00:00","triaged_at":"2026-11-05T03:33:07+00:00","updated_at":"2026-11-05T03:33:07+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-05T03:33:07Z","model":"claude-haiku-5-5","output":{"fix":"- Move to a DStarGateway build that includes commit `7b75de6`","reach":"network","title":"DStarGateway: integer underflow in APRS callsign parsing from empty field","impact":"high","summary":"DStarGateway, a D-STAR amateur radio gateway, has an integer underflow in dstarCallsignToAPRS when the RS-MS1A sender field is empty. The sources do not state what an attacker can achieve beyond the memory corruption this implies.","audience":"developers","category":"package","nicknames":[],"who_cares":["dstargateway","amateur-radio","d-star"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown; memory corruption from an integer underflow","analyst_note":"Confirm the reachable trigger path (network-received RS-MS1A data?) and the consequence of the underflow from the NVD entry or the upstream commit.","how_to_check":"- Check whether DStarGateway from G4KLX or F4FXL is installed, and its version, against the fixed commit `7b75de6`\n- Look for the RS-MS1A sender handling in APRSUtils.cpp\n- unknown whether other checks apply","plain_action":"","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000671,"input_tokens":4225,"output_tokens":496,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-122992':13A,16A '-2026':12A,15A '7b75de6':71C 'achiev':57B 'amateur':18B,30B 'amateur-radio':17B 'apr':5A 'aprsutils.cpp':74C 'attack':55B 'beyond':58B 'callsign':6A 'corrupt':61B 'cve':11A,14A 'd':21B,28B 'd-star':20B,27B 'dstarcallsigntoapr':38B,72C 'dstargateway':1A,23B,25B,66C,69C 'empti':9A,47B,81C 'f4fxl':68C 'field':10A,45B,86C 'g4klx':65C 'gateway':32B 'impli':63B 'integ':2A,35B,77C 'memori':60B 'ms1a':43B,84C 'packag':24B 'pars':7A 'radio':19B,31B 'rs':42B,83C 'rs-ms1a':41B,82C 'sender':44B,85C 'sourc':49B 'star':22B,29B 'state':52B 'underflow':3A,36B,78C 'via':79C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["amateurradio","critical","dstar","dstargateway","package"],"campaign_type":null,"first_public_at":"2026-11-05T03:17:25+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"cve@mitre.org","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-122992","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122992","severity":null,"published_at":"2026-11-05T03:17:25+00:00","modified_at":"2026-11-05T03:17:25+00:00","first_seen_at":"2026-11-05T03:31:42+00:00","fetched_at":"2026-11-05T03:31:42+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}