{"id":"CVE-2026-3783","title":"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 re…","summary":"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 re…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-522","CWE-201"],"vendor":"haxx","product":"curl","affected":["curl >= 7.33.0, < 8.19.0"],"patched":["curl 8.19.0"],"published":"2026-03-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T07:16:27.720","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-3783","references":[{"url":"https://curl.se/docs/CVE-2026-3783.html","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://curl.se/docs/CVE-2026-3783.json","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3583983","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"http://www.openwall.com/lists/oss-security/2026/03/11/2","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3783.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-3783"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2446450"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3783"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3783"},{"url":"https://access.redhat.com/errata/RHSA-2026:55450"},{"url":"https://access.redhat.com/errata/RHSA-2026:55439"},{"url":"https://access.redhat.com/errata/RHSA-2026:63140"},{"url":"https://access.redhat.com/errata/RHSA-2026:63135"},{"url":"https://access.redhat.com/errata/RHSA-2026:63138"},{"url":"https://access.redhat.com/errata/RHSA-2026:61783"},{"url":"https://access.redhat.com/errata/RHSA-2026:6893"},{"url":"https://access.redhat.com/errata/RHSA-2026:66018"},{"url":"https://access.redhat.com/errata/RHSA-2026:58981"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-11T14:25:28.836990Z"},"epss":0.00454,"epssPercentile":0.38666,"ingestedAt":"2026-09-15T07:33:29.262Z","scores":{"nvd":5.3,"vendor":5.7},"slug":"CVE-2026-3783","body":"## Overview\n\nWhen 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.\n\n## Affected\n\n- `curl >= 7.33.0, < 8.19.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `curl 8.19.0`\n\n## Vendor advisories\n\n- **RHSA-2026:55450** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55450)\n- **RHSA-2026:55439** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55439)\n- **RHSA-2026:63140** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63140)\n- **RHSA-2026:63135** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63135)\n- **RHSA-2026:63138** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63138)\n- **RHSA-2026:61783** · Red Hat · fixed in: Red Hat Discovery 2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61783)\n- **RHSA-2026:6893** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-04-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:6893)\n- **RHSA-2026:66018** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:66018)\n- **RHSA-2026:58981** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58981)\n- **Red Hat VEX** · Moderate · affected: Confidential Compute Attestation, Logging Subsystem for Red Hat OpenShift, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · no fix planned: Confidential Compute Attestation, Logging Subsystem for Red Hat OpenShift, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3783.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}