{"id":"CVE-2026-116543","kind":"vulnerability","aliases":["CVE-2026-116543"],"related":[],"title":"Open5GS: empty multipart boundary lets unauthenticated requests corrupt memory and crash","description":"Open5GS 1.3.0 through 2.8.0 contains a heap out-of-bounds write vulnerability in parse_multipart() that allows unauthenticated attackers to corrupt memory by supplying an empty multipart boundary. Attackers can send a single crafted multipart/related request to the SBI interface of any network function, overflowing the lookbehind buffer and crashing it.","summary":"Open5GS 1.3.0 through 2.8.0 has a heap out-of-bounds write in parse_multipart() triggered by an empty multipart boundary. An unauthenticated attacker can send one crafted multipart/related request to the SBI interface of a network function, corrupting memory and crashing it.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["5g-core","infrastructure","open5gs","self-hosted","telecom"],"not_affected_if":["sbi-not-reachable","version-outside-range"],"how_to_check":"- Check the installed Open5GS version against `1.3.0` through `2.8.0`\n- Look for SBI interface exposure: unknown","fix":"- Move to a release newer than `2.8.0`, version number unknown from sources\n- Restrict access to the SBI interface to trusted network functions: unknown","status":"open","published_at":"2026-10-26T16:17:19+00:00","first_seen_at":"2026-10-26T16:31:01+00:00","triaged_at":"2026-10-26T16:32:43+00:00","updated_at":"2026-10-26T16:32:43+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-26T16:32:43Z","model":"claude-haiku-5-5","output":{"fix":"- Move to a release newer than `2.8.0`, version number unknown from sources\n- Restrict access to the SBI interface to trusted network functions: unknown","reach":"network","title":"Open5GS: empty multipart boundary lets unauthenticated requests corrupt memory and crash","impact":"medium","summary":"Open5GS 1.3.0 through 2.8.0 has a heap out-of-bounds write in parse_multipart() triggered by an empty multipart boundary. An unauthenticated attacker can send one crafted multipart/related request to the SBI interface of a network function, corrupting memory and crashing it.","category":"infrastructure","nicknames":[],"who_cares":["open5gs","telecom","5g-core","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Remote crash of a 5G network function; code execution not stated","analyst_note":"Check the NVD entry for exploitability and whether the heap write can be turned into code execution, and find the fixed release version.","how_to_check":"- Check the installed Open5GS version against `1.3.0` through `2.8.0`\n- Look for SBI interface exposure: unknown","needs_analyst":true,"not_affected_if":["version-outside-range","sbi-not-reachable"],"who_is_affected":"Operators running Open5GS versions 1.3.0 through 2.8.0 with the SBI interface reachable by untrusted hosts. The sources describe crashes of network functions via the SBI interface; whether the write leads to code execution is not stated. Teams not running Open5GS in this range can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000628,"input_tokens":3356,"output_tokens":584,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-116543':14A,17A '-2026':13A,16A '1.3.0':28B,70C '2.8.0':30B,72C '5g':19B '5g-core':18B 'allow':86C 'attack':50B,88C,98C 'bound':37B,79C 'boundari':4A,47B,97C 'buffer':117C 'contain':73C 'core':20B 'corrupt':8A,65B,90C 'craft':54B,103C 'crash':11A,68B,119C 'cve':12A,15A 'empti':2A,45B,95C 'function':64B,113C 'heap':33B,75C 'host':25B 'infrastructur':21B 'interfac':60B,109C 'let':5A 'lookbehind':116C 'memori':9A,66B,91C 'multipart':3A,41B,46B,84C,96C 'multipart/related':55B,104C 'network':63B,112C 'one':53B 'open5gs':1A,22B,27B,69C 'out-of-bound':34B,76C 'overflow':114C 'pars':40B,83C 'request':7A,56B,105C 'sbi':59B,108C 'self':24B 'self-host':23B 'send':52B,100C 'singl':102C 'suppli':93C 'telecom':26B 'trigger':42B 'unauthent':6A,49B,87C 'vulner':81C 'write':38B,80C","nicknames":[],"mitigations":[],"who_affected":"Operators running Open5GS versions 1.3.0 through 2.8.0 with the SBI interface reachable by untrusted hosts. The sources describe crashes of network functions via the SBI interface; whether the write leads to code execution is not stated. Teams not running Open5GS in this range can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T16:17:19+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:N/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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-116543","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116543","severity":null,"published_at":"2026-10-26T16:17:19+00:00","modified_at":"2026-10-26T16:17:19+00:00","first_seen_at":"2026-10-26T16:31:01+00:00","fetched_at":"2026-10-26T16:31:01+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"}