{"id":"CURL-CVE-2026-3784","summary":"wrong proxy connection reuse with credentials","details":"curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a\nserver, even if the new request uses different credentials for the HTTP proxy.\nThe proper behavior is to create or use a separate connection.","aliases":["CVE-2026-3784"],"modified":"2026-04-25T20:22:30.332592Z","published":"2026-03-11T08:00:00Z","database_specific":{"package":"curl","URL":"https://curl.se/docs/CVE-2026-3784.json","last_affected":"8.18.0","CWE":{"desc":"Authentication Bypass by Primary Weakness","id":"CWE-305"},"issue":"https://hackerone.com/reports/3584903","affects":"both","www":"https://curl.se/docs/CVE-2026-3784.html","severity":"Low"},"affected":[{"ranges":[{"type":"SEMVER","events":[{"introduced":"7.7"},{"fixed":"8.19.0"}]},{"type":"GIT","repo":"https://github.com/curl/curl.git","events":[{"introduced":"a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4"},{"fixed":"5f13a7645e565c5c1a06f3ef86e97afb856fb364"}]}],"versions":["8.18.0","8.17.0","8.16.0","8.15.0","8.14.1","8.14.0","8.13.0","8.12.1","8.12.0","8.11.1","8.11.0","8.10.1","8.10.0","8.9.1","8.9.0","8.8.0","8.7.1","8.7.0","8.6.0","8.5.0","8.4.0","8.3.0","8.2.1","8.2.0","8.1.2","8.1.1","8.1.0","8.0.1","8.0.0","7.88.1","7.88.0","7.87.0","7.86.0","7.85.0","7.84.0","7.83.1","7.83.0","7.82.0","7.81.0","7.80.0","7.79.1","7.79.0","7.78.0","7.77.0","7.76.1","7.76.0","7.75.0","7.74.0","7.73.0","7.72.0","7.71.1","7.71.0","7.70.0","7.69.1","7.69.0","7.68.0","7.67.0","7.66.0","7.65.3","7.65.2","7.65.1","7.65.0","7.64.1","7.64.0","7.63.0","7.62.0","7.61.1","7.61.0","7.60.0","7.59.0","7.58.0","7.57.0","7.56.1","7.56.0","7.55.1","7.55.0","7.54.1","7.54.0","7.53.1","7.53.0","7.52.1","7.52.0","7.51.0","7.50.3","7.50.2","7.50.1","7.50.0","7.49.1","7.49.0","7.48.0","7.47.1","7.47.0","7.46.0","7.45.0","7.44.0","7.43.0","7.42.1","7.42.0","7.41.0","7.40.0","7.39.0","7.38.0","7.37.1","7.37.0","7.36.0","7.35.0","7.34.0","7.33.0","7.32.0","7.31.0","7.30.0","7.29.0","7.28.1","7.28.0","7.27.0","7.26.0","7.25.0","7.24.0","7.23.1","7.23.0","7.22.0","7.21.7","7.21.6","7.21.5","7.21.4","7.21.3","7.21.2","7.21.1","7.21.0","7.20.1","7.20.0","7.19.7","7.19.6","7.19.5","7.19.4","7.19.3","7.19.2","7.19.1","7.19.0","7.18.2","7.18.1","7.18.0","7.17.1","7.17.0","7.16.4","7.16.3","7.16.2","7.16.1","7.16.0","7.15.5","7.15.4","7.15.3","7.15.2","7.15.1","7.15.0","7.14.1","7.14.0","7.13.2","7.13.1","7.13.0","7.12.3","7.12.2","7.12.1","7.12.0","7.11.2","7.11.1","7.11.0","7.10.8","7.10.7","7.10.6","7.10.5","7.10.4","7.10.3","7.10.2","7.10.1","7.10","7.9.8","7.9.7","7.9.6","7.9.5","7.9.4","7.9.3","7.9.2","7.9.1","7.9","7.8.1","7.8","7.7.3","7.7.2","7.7.1","7.7"],"database_specific":{"vanir_signatures":[{"signature_type":"Function","deprecated":false,"digest":{"function_hash":"304424982618101118051780626607065937137","length":250},"source":"https://github.com/curl/curl.git/commit/5f13a7645e565c5c1a06f3ef86e97afb856fb364","signature_version":"v1","target":{"file":"lib/url.c","function":"proxy_info_matches"},"id":"CURL-CVE-2026-3784-1563ccc6"},{"signature_type":"Function","deprecated":false,"digest":{"function_hash":"156847319230870095583887509199151235125","length":251},"source":"https://github.com/curl/curl.git/commit/5f13a7645e565c5c1a06f3ef86e97afb856fb364","signature_version":"v1","target":{"file":"lib/url.c","function":"socks_proxy_info_matches"},"id":"CURL-CVE-2026-3784-24fdd663"},{"signature_type":"Line","deprecated":false,"digest":{"threshold":0.9,"line_hashes":["28198451978076953179959188918451268147","281673914764183415723044625038716534191","200855833354261436815608522668489466846","5387804322910666783572395908044232661","236020795518562151691835007362979410387","17450557644387912671244308544988815862","143048806250994210279637270903948951646","140460714839795236180824974953309975661","333720084210032823607267343226770582379","331697448246752651778648505556653532906","22128409967120680154956528188638186822","137746103134972144068270578958105877138","65788874135120305231986682270701016923","60737932765286278430331372663472782818","184914865177630377594351218661619057487","301989571442316518697531570240250833782","177716688628404441639553594179643257215","67479828686876523434398651942505625370","172521746541650491399053767548077956775","197718837176355740128997674513855282001","139478862402738275211722289962537500430"]},"source":"https://github.com/curl/curl.git/commit/5f13a7645e565c5c1a06f3ef86e97afb856fb364","signature_version":"v1","target":{"file":"lib/url.c"},"id":"CURL-CVE-2026-3784-db376948"}],"vanir_signatures_modified":"2026-04-25T20:22:30Z","source":"https://curl.se/docs/CURL-CVE-2026-3784.json"}}],"schema_version":"1.7.5","credits":[{"name":"Muhamad Arga Reksapati (HackerOne: nobcoder)","type":"FINDER"},{"name":"Stefan Eissing","type":"REMEDIATION_DEVELOPER"}]}