--- id: CVE-2025-9086 title: '1' summary: |- 1. A cookie is set using the `secure` keyword for `https://target` 2. curl is redirected to or otherwise made to speak with `http://target` (same hostname, but using clear text HTTP) using the same cookie set 3. The same cookie name i… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-125 vendor: haxx product: curl affected: - 'curl >= 8.13.0, < 8.16.0' - debian_linux = 11.0 patched: - curl 8.16.0 published: '2025-09-12' updated: '2026-09-14' sourceUpdated: '2026-09-14T21:16:59.523' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9086' references: - url: 'https://curl.se/docs/CVE-2025-9086.html' label: 2499f714-1537-4658-8207-48ae4bb9eae9 - url: 'https://curl.se/docs/CVE-2025-9086.json' label: 2499f714-1537-4658-8207-48ae4bb9eae9 - url: 'https://hackerone.com/reports/3294999' label: 2499f714-1537-4658-8207-48ae4bb9eae9 - url: 'http://www.openwall.com/lists/oss-security/2025/09/10/1' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2026/01/msg00002.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-089022.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-253495.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-9086.json - url: 'https://access.redhat.com/security/cve/CVE-2025-9086' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2394750' - url: 'https://www.cve.org/CVERecord?id=CVE-2025-9086' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9086' - url: 'https://github.com/curl/curl/commit/c6ae07c6a541e0e96d0040afb6' - url: 'https://access.redhat.com/errata/RHSA-2026:1825' - url: 'https://access.redhat.com/errata/RHSA-2025:23043' - url: 'https://access.redhat.com/errata/RHSA-2026:1350' - url: 'https://access.redhat.com/errata/RHSA-2026:1477' - url: 'https://access.redhat.com/errata/RHSA-2025:23383' - url: 'https://access.redhat.com/errata/RHSA-2025:23126' - url: 'https://access.redhat.com/errata/RHSA-2025:23127' - url: 'https://access.redhat.com/errata/RHSA-2025:23125' - url: 'https://access.redhat.com/errata/RHSA-2026:82354' - url: 'https://access.redhat.com/errata/RHSA-2026:82372' - url: 'https://access.redhat.com/errata/RHSA-2026:82347' - url: 'https://access.redhat.com/errata/RHSA-2026:1736' - url: 'https://access.redhat.com/errata/RHSA-2026:6893' - url: 'https://access.redhat.com/errata/RHSA-2026:77255' - url: 'https://access.redhat.com/errata/RHSA-2026:2485' - url: 'https://access.redhat.com/errata/RHSA-2026:4943' - url: 'https://access.redhat.com/errata/RHSA-2026:2563' tags: - nvd - cve.org - csaf - vex - red-hat - score-dispute epss: 0.01463 epssPercentile: 0.73487 ssvc: exploitation: none automatable: 'no' technicalImpact: partial timestamp: '2025-09-12T17:15:47.921625Z' ingestedAt: '2026-09-14T21:15:17.560Z' scores: nvd: 7.5 vendor: 5.3 --- ## Overview 1. A cookie is set using the `secure` keyword for `https://target` 2. curl is redirected to or otherwise made to speak with `http://target` (same hostname, but using clear text HTTP) using the same cookie set 3. The same cookie name is set - but with only a slash as path (`path="/"`). Since this site is not secure, the cookie *should* be ignored. 4. A bug in the path comparison logic makes curl read outside a heap buffer boundary The bug either causes a crash or it potentially makes the comparison come to the wrong conclusion and lets the clear-text site override the contents of the secure cookie, contrary to expectations and depending on the memory contents immediately following the single-byte allocation that holds the path. The presumed and correct behavior would be to plainly ignore the second set of the cookie since it was already set as secure on a secure host so overriding it on an insecure host should not be okay. ## Affected - `curl >= 8.13.0, < 8.16.0` - `debian_linux = 11.0` ## Remediation Upgrade past the affected range: - `curl 8.16.0` ## Vendor advisories - **RHSA-2026:1825** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-02-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:1825) - **RHSA-2025:23043** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6) · released 2025-12-10 · [advisory](https://access.redhat.com/errata/RHSA-2025:23043) - **RHSA-2026:1350** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-01-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:1350) - **RHSA-2026:1477** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · released 2026-01-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:1477) - **RHSA-2025:23383** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2025-12-18 · [advisory](https://access.redhat.com/errata/RHSA-2025:23383) - **RHSA-2025:23126** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.9.0) · released 2025-12-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:23126) - **RHSA-2025:23127** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2025-12-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:23127) - **RHSA-2025:23125** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS EUS (v.9.4) · released 2025-12-11 · [advisory](https://access.redhat.com/errata/RHSA-2025:23125) - **RHSA-2026:82354** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.18 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82354) - **RHSA-2026:82372** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.18 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82372) - **RHSA-2026:82347** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.18 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82347) - **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat JBoss Core Services, Red Hat OpenShift Container Platform 4, Red Hat OpenShift Dev Spaces, Red Hat Trusted Profile Analyzer · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat JBoss Core Services, Red Hat OpenShift Container Platform 4, … · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-9086.json)