{"id":"CURL-CVE-2026-3783","summary":"token leak with redirect and netrc","details":"When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer\nperforms a redirect to a second URL, curl could leak that token to the second\nhostname under some circumstances.\n\nIf the hostname that the first request is redirected to has information in the\nused .netrc file, with either of the `machine` or `default` keywords, curl\nwould pass on the bearer token set for the first host also to the second one.","aliases":["CVE-2026-3783"],"modified":"2026-09-07T14:06:32.038178Z","published":"2026-03-11T08:00:00Z","database_specific":{"issue":"https://hackerone.com/reports/3583983","last_affected":"8.18.0","package":"curl","severity":"Medium","www":"https://curl.se/docs/CVE-2026-3783.html","CWE":{"desc":"Insufficiently Protected Credentials","id":"CWE-522"},"URL":"https://curl.se/docs/CVE-2026-3783.json","affects":"both"},"affected":[{"ranges":[{"type":"SEMVER","events":[{"introduced":"7.33.0"},{"fixed":"8.19.0"}]},{"type":"SEMVER","events":[{"introduced":"7.33.0"},{"fixed":"8.16.1"}]},{"type":"SEMVER","events":[{"introduced":"7.33.0"},{"fixed":"8.14.2"}]},{"type":"GIT","repo":"https://github.com/curl/curl.git","events":[{"introduced":"06c1bea72faabb6fad4b7ef818aafaa336c9a7aa"},{"fixed":"e3d7401a32a46516c9e5ee877e613e62ed35bddc"}]}],"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","rc-8_19_0-3","rc-8_19_0-2","rc-8_19_0-1","curl-8_18_0","rc-8_18_0-3","rc-8_18_0-2","rc-8_18_0-1","curl-8_17_0","curl-8_16_0","curl-8_15_0","curl-8_14_1","curl-8_14_0","curl-8_13_0","curl-8_12_1","curl-8_12_0","curl-8_11_1","curl-8_11_0","curl-8_10_1","curl-8_10_0","curl-8_9_1","curl-8_9_0","curl-8_8_0","curl-8_7_1","curl-8_7_0","curl-8_6_0","curl-8_5_0","tiny-curl-8_4_0","curl-8_4_0","curl-8_3_0","curl-8_2_1","curl-8_2_0","curl-8_1_2","curl-8_1_1","curl-8_1_0","curl-8_0_1","curl-8_0_0","curl-7_88_1","curl-7_88_0","curl-7_87_0","curl-7_86_0","curl-7_85_0","curl-7_84_0","curl-7_83_1","curl-7_83_0","curl-7_82_0","curl-7_81_0","curl-7_80_0","curl-7_79_1","curl-7_79_0","curl-7_78_0","curl-7_77_0","curl-7_76_1","curl-7_76_0","curl-7_75_0","curl-7_74_0","curl-7_73_0","tiny-curl-7_72_0","curl-7_72_0","curl-7_71_1","curl-7_71_0","curl-7_70_0","curl-7_69_1","curl-7_69_0","curl-7_68_0","curl-7_67_0","curl-7_66_0","curl-7_65_3","curl-7_65_2","curl-7_65_1","curl-7_65_0","curl-7_64_1","curl-7_64_0","curl-7_63_0","curl-7_62_0","curl-7_61_1","curl-7_61_0","curl-7_60_0","curl-7_59_0","curl-7_58_0","curl-7_57_0","curl-7_56_1","curl-7_56_0","curl-7_55_1","curl-7_55_0","curl-7_54_1","curl-7_54_0","curl-7_53_1","curl-7_53_0","curl-7_52_1","curl-7_52_0","curl-7_51_0","curl-7_50_3","curl-7_50_2","curl-7_50_1","curl-7_50_0","curl-7_49_1","curl-7_49_0","curl-7_48_0","curl-7_47_1","curl-7_47_0","curl-7_46_0","curl-7_45_0","curl-7_44_0","curl-7_43_0","curl-7_42_1","curl-7_42_0","curl-7_41_0","curl-7_40_0","curl-7_39_0","curl-7_38_0","curl-7_37_1","curl-7_37_0","curl-7_36_0","curl-7_35_0","curl-7_34_0","curl-7_33_0"],"database_specific":{"vanir_signatures":[{"deprecated":false,"digest":{"function_hash":"255706826044943101070019469023341439587","length":2311},"id":"CURL-CVE-2026-3783-2c073f62","signature_type":"Function","signature_version":"v1","source":"https://github.com/curl/curl.git/commit/e3d7401a32a46516c9e5ee877e613e62ed35bddc","target":{"file":"lib/http.c","function":"output_auth_headers"}},{"deprecated":false,"digest":{"line_hashes":["265035635595171995197433923812567969557","41903243714880020210981115211245487159","4794297661649355252422450833806603524","93029269979120594134270703357211590550"],"threshold":0.9},"id":"CURL-CVE-2026-3783-789c9b54","signature_type":"Line","signature_version":"v1","source":"https://github.com/curl/curl.git/commit/e3d7401a32a46516c9e5ee877e613e62ed35bddc","target":{"file":"lib/http.c"}}],"source":"https://curl.se/docs/CURL-CVE-2026-3783.json","vanir_signatures_modified":"2026-09-07T14:06:32Z"}}],"schema_version":"1.9.0","credits":[{"name":"spectreglobalsec on hackerone","type":"FINDER"},{"name":"Daniel Stenberg","type":"REMEDIATION_DEVELOPER"}]}