{"id":"CVE-2026-95620","kind":"vulnerability","aliases":["CVE-2026-95620"],"related":[],"title":"Qt: HTTP/2 client use-after-free lets a malicious server crash apps","description":"A use-after-free vulnerability in the Qt QNetworkAccessManager HTTP/2 client support of the Qt Network module allows a malicious or compromised HTTP/2 server to cause the client application to crash, affecting availability.","summary":"The Qt Network module's QNetworkAccessManager HTTP/2 client contains a use-after-free bug. A malicious or compromised HTTP/2 server can crash the client application, which affects availability only.","severity":"low","cvss":2.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["c++","desktop-apps","package","qt"],"not_affected_if":["http1-only","trusted-servers-only"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-23T12:18:20+00:00","first_seen_at":"2026-10-23T21:57:33+00:00","triaged_at":"2026-10-25T04:50:00+00:00","updated_at":"2026-10-25T04:50:00+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:50:00Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"internet","title":"Qt: HTTP/2 client use-after-free lets a malicious server crash apps","impact":"low","summary":"The Qt Network module's QNetworkAccessManager HTTP/2 client contains a use-after-free bug. A malicious or compromised HTTP/2 server can crash the client application, which affects availability only.","category":"package","nicknames":[],"who_cares":["qt","c++","desktop-apps"],"confidence":0.6,"needs_auth":"no","worst_case":"Client application crashes when a hostile HTTP/2 server responds","analyst_note":"Check the Qt advisory or NVD entry for affected and fixed Qt versions.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["http1-only","trusted-servers-only"],"who_is_affected":"Applications built on the Qt Network module that make HTTP/2 requests through QNetworkAccessManager and may talk to untrusted or compromised servers. Apps that only use HTTP/1.1 or only talk to trusted servers are less exposed. unknown whether the sources specify affected Qt versions.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000547,"input_tokens":3302,"output_tokens":434,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-95620':16A,19A 'affect':53B,87C 'allow':73C 'app':13A,23B 'applic':51B,84C 'avail':54B,88C 'bug':40B 'c':20B 'caus':81C 'client':3A,33B,50B,66C,83C 'compromis':44B,77C 'contain':34B 'crash':12A,48B,86C 'cve':14A,17A 'desktop':22B 'desktop-app':21B 'free':7A,39B,59C 'http/2':2A,32B,45B,65C,78C 'let':8A 'malici':10A,42B,75C 'modul':29B,72C 'network':28B,71C 'packag':24B 'qnetworkaccessmanag':31B,64C 'qt':1A,25B,27B,63C,70C 'server':11A,46B,79C 'support':67C 'use':5A,37B,57C 'use-after-fre':4A,36B,56C 'vulner':60C","nicknames":[],"mitigations":[],"who_affected":"Applications built on the Qt Network module that make HTTP/2 requests through QNetworkAccessManager and may talk to untrusted or compromised servers. Apps that only use HTTP/1.1 or only talk to trusted servers are less exposed. unknown whether the sources specify affected Qt versions.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T12:18:20+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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:N/R:U/V:X/RE:L/U:Green","cvss_by":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-95620","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95620","severity":null,"published_at":"2026-10-23T12:18:20+00:00","modified_at":"2026-10-23T19:45:03+00:00","first_seen_at":"2026-10-23T21:57:33+00:00","fetched_at":"2026-10-23T22:29:03+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"}