{"id":"CVE-2026-104591","kind":"vulnerability","aliases":["CVE-2026-104591"],"related":[],"title":"libosmocore: buffer overflow in IuUP payload CRC lets remote attackers crash services","description":"libosmocore through 1.14.1 contains a buffer overflow in osmo_iuup_compute_payload_crc() in src/gsm/iuup.c. This allows a remote attacker to cause a denial of service.","summary":"libosmocore through 1.14.1 has a buffer overflow in osmo_iuup_compute_payload_crc() in src/gsm/iuup.c. The sources say a remote attacker can cause a denial of service.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cellular","infrastructure","libosmocore","osmocom","telecom"],"not_affected_if":["no-libosmocore"],"how_to_check":"- Check the installed libosmocore version with `pkg-config --modversion libosmocore` (unknown if the sources list a fixed version)\n- Look for `osmo_iuup_compute_payload_crc` in the library or in software linked against it (unknown if the sources name a tool)","fix":"- Upgrade libosmocore past `1.14.1` once a fixed release is published (unknown: the sources do not name a fixed version)","status":"open","published_at":"2026-10-26T19:16:28+00:00","first_seen_at":"2026-10-26T19:32:05+00:00","triaged_at":"2026-10-26T19:34:06+00:00","updated_at":"2026-10-26T19:34:06+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-10-26T19:34:06Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade libosmocore past `1.14.1` once a fixed release is published (unknown: the sources do not name a fixed version)","reach":"network","title":"libosmocore: buffer overflow in IuUP payload CRC lets remote attackers crash services","impact":"low","summary":"libosmocore through 1.14.1 has a buffer overflow in osmo_iuup_compute_payload_crc() in src/gsm/iuup.c. The sources say a remote attacker can cause a denial of service.","category":"infrastructure","nicknames":[],"who_cares":["libosmocore","osmocom","telecom","cellular"],"confidence":0.4,"needs_auth":"unknown","worst_case":"remote crash of the service through denial of service","analyst_note":"Check the NVD entry and the upstream libosmocore advisory for the fixed version, whether the bug is reachable without authentication, and whether it is a plain DoS or can lead further.","how_to_check":"- Check the installed libosmocore version with `pkg-config --modversion libosmocore` (unknown if the sources list a fixed version)\n- Look for `osmo_iuup_compute_payload_crc` in the library or in software linked against it (unknown if the sources name a tool)","needs_analyst":true,"not_affected_if":["no-libosmocore"],"who_is_affected":"Systems running libosmocore 1.14.1 or earlier, typically open-source cellular network software (Osmocom stack) that parses Iu user-plane traffic. Sources do not say which deployments reach the vulnerable function, so teams that do not run Osmocom or libosmocore can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000627,"input_tokens":3295,"output_tokens":595,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-104591':15A,18A '-2026':14A,17A '1.14.1':26B,53C 'allow':67C 'attack':10A,44B,70C 'buffer':2A,29B,56C 'caus':46B,72C 'cellular':19B 'comput':34B,61C 'contain':54C 'crash':11A 'crc':7A,36B,63C 'cve':13A,16A 'denial':48B,74C 'infrastructur':20B 'iuup':5A,33B,60C 'let':8A 'libosmocor':1A,21B,24B,51C 'osmo':32B,59C 'osmocom':22B 'overflow':3A,30B,57C 'payload':6A,35B,62C 'remot':9A,43B,69C 'say':41B 'servic':12A,50B,76C 'sourc':40B 'src/gsm/iuup.c':38B,65C 'telecom':23B","nicknames":[],"mitigations":[],"who_affected":"Systems running libosmocore 1.14.1 or earlier, typically open-source cellular network software (Osmocom stack) that parses Iu user-plane traffic. Sources do not say which deployments reach the vulnerable function, so teams that do not run Osmocom or libosmocore can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T19:16:28+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-104591","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104591","severity":null,"published_at":"2026-10-26T19:16:28+00:00","modified_at":"2026-10-26T19:16:28+00:00","first_seen_at":"2026-10-26T19:32:05+00:00","fetched_at":"2026-10-26T19:32:05+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}