{"id":"CVE-2026-119600","kind":"vulnerability","aliases":["CVE-2026-119600"],"related":[],"title":"tcpflow: out-of-bounds read leaks process memory via forged packet lengths","description":"tcpflow through 1.6.1 contains an out-of-bounds read vulnerability that allows unauthenticated attackers to read process memory by sending packets with forged IP payload lengths. Attackers can inject crafted IPv4 or IPv6 TCP packets into captured traffic or pcap files to leak adjacent memory into reconstructed flow files or crash tcpflow.","summary":"tcpflow, a tool that reconstructs network flows from captured traffic, reads past the end of a buffer when a packet's IP payload length is forged. An attacker who can inject crafted IPv4 or IPv6 TCP packets, or supply a pcap file, can leak adjacent process memory into the flow files or crash the tool.","severity":"medium","cvss":6.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["network-forensics","package","pcap-analysis","tcpflow"],"not_affected_if":["no-untrusted-pcap-input"],"how_to_check":"- Check the installed version with `tcpflow -V` and see whether it is `1.6.1` or older.\n- Look for tcpflow in pipelines that process untrusted or externally supplied pcap files.","fix":null,"status":"open","published_at":"2026-10-30T14:16:48+00:00","first_seen_at":"2026-10-30T14:30:54+00:00","triaged_at":"2026-10-30T14:32:50+00:00","updated_at":"2026-10-30T14:32:50+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-30T14:32:50Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"tcpflow: out-of-bounds read leaks process memory via forged packet lengths","impact":"medium","summary":"tcpflow, a tool that reconstructs network flows from captured traffic, reads past the end of a buffer when a packet's IP payload length is forged. An attacker who can inject crafted IPv4 or IPv6 TCP packets, or supply a pcap file, can leak adjacent process memory into the flow files or crash the tool.","audience":"developers","category":"package","nicknames":[],"who_cares":["tcpflow","pcap-analysis","network-forensics"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"process memory leaks into output files or the tool crashes","analyst_note":"Sources give only the NVD entry; check the tcpflow project for a fixed release and whether the attack needs live capture or only pcap input.","how_to_check":"- Check the installed version with `tcpflow -V` and see whether it is `1.6.1` or older.\n- Look for tcpflow in pipelines that process untrusted or externally supplied pcap files.\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["no-untrusted-pcap-input"],"who_is_affected":"unknown","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.00066,"input_tokens":4158,"output_tokens":489,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119600':16A,19A '-2026':15A,18A '1.6.1':85C 'adjac':72B,127C 'allow':95C 'analysi':26B 'attack':55B,97C,110C 'bound':5A,91C 'buffer':44B 'captur':36B,120C 'contain':86C 'craft':59B,113C 'crash':80B,134C 'cve':14A,17A 'end':41B 'file':69B,78B,124C,132C 'flow':34B,77B,131C 'forens':22B 'forg':11A,53B,106C 'inject':58B,112C 'ip':49B,107C 'ipv4':60B,114C 'ipv6':62B,116C 'leak':7A,71B,126C 'length':13A,51B,109C 'memori':9A,74B,101C,128C 'network':21B,33B 'network-forens':20B 'out-of-bound':2A,88C 'packag':23B 'packet':12A,47B,64B,104C,118C 'past':39B 'payload':50B,108C 'pcap':25B,68B,123C 'pcap-analysi':24B 'process':8A,73B,100C 'read':6A,38B,92C,99C 'reconstruct':32B,130C 'send':103C 'suppli':66B 'tcp':63B,117C 'tcpflow':1A,27B,28B,83C,135C 'tool':30B,82B 'traffic':37B,121C 'unauthent':96C 'via':10A 'vulner':93C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"first_public_at":"2026-10-30T14:16:48+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/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-2026-119600","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119600","severity":null,"published_at":"2026-10-30T14:16:48+00:00","modified_at":"2026-10-30T14:16:48+00:00","first_seen_at":"2026-10-30T14:30:54+00:00","fetched_at":"2026-10-30T14:30:54+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"}