{"id":"CVE-2025-4035","aliases":["ALSA-2025:8128","AZL-61665","AZL-61670","DEBIAN-CVE-2025-4035","EUVD-2025-15014","GHSA-9685-44wp-34gm","RHSA-2025:8128","RLSA-2025:8128","ROOT-OS-DEBIAN-13-CVE-2025-4035","UBUNTU-CVE-2025-4035"],"status":"published","title":"Libsoup: cookie domain validation bypass via uppercase characters in libsoup","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00542,"percentile":0.45985,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-178"],"published":"2025-04-29T12:56:22Z","modified":"2026-11-10T02:50:17Z","fixes":[{"ecosystem":"Root:Debian:13","package":"libsoup3","fixed_in":["3.6.5-3.aikido.4","3.6.5-3.aikido.3","3.6.5-3.root.io.2","3.6.5-3.aikido.5","3.6.5-3.aikido.6","3.6.5-3.aikido.7","3.6.5-3.aikido.8","3.6.5-3.aikido.9"],"sources":["osv"]},{"ecosystem":"Root:Debian:13","package":"rootio-libsoup3","fixed_in":["3.6.5-3.aikido.4","3.6.5-3.aikido.3","3.6.5-3.root.io.2","3.6.5-3.aikido.5","3.6.5-3.aikido.6","3.6.5-3.aikido.7","3.6.5-3.aikido.8","3.6.5-3.aikido.9"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"AlmaLinux:10","package":"libsoup3-doc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.5-3.el10_0.6"}]}],"bundled":4},{"source":"osv","ecosystem":"Azure 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hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 6"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2025:8128","tags":["vendor-advisory","x_refsource_REDHAT","advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-4035","tags":["vdb-entry","x_refsource_REDHAT","report","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2362651","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/443","tags":["article"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/work_items/443","tags":["exploit"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-4035","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-9685-44wp-34gm"},{"url":"https://access.redhat.com/security/cve/CVE-2025-32049","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-32907","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-4948","tags":["report"]},{"url":"https://bugzilla.redhat.com/2357066","tags":["report"]},{"url":"https://bugzilla.redhat.com/2359342","tags":["report"]},{"url":"https://bugzilla.redhat.com/2362651","tags":["report"]},{"url":"https://bugzilla.redhat.com/2367183","tags":["report"]},{"url":"https://errata.almalinux.org/10/ALSA-2025-8128.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-4035","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2357066","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2359342","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2367183","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_8128.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-4035","tags":["advisory","report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-4948","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-4948","tags":["advisory"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/449","tags":["article"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-32049","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-32049","tags":["advisory"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/390","tags":["article"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/408","tags":["article"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-32907","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-32907","tags":["advisory"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/428","tags":["article"]},{"url":"https://errata.rockylinux.org/RLSA-2025:8128","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-4035","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-4035","title":"Libsoup: cookie domain validation bypass via uppercase characters in libsoup","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T12:56:22.726Z","modified":"2026-11-05T15:46:13.53Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-178"],"updated_at":"2026-11-05T16:36:33.176634Z"}],"euvd":[{"id":"EUVD-2025-15014","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T12:56:22Z","modified":"2026-11-05T15:46:13Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-05T18:00:59.460287Z"}],"ghsa":[{"id":"GHSA-9685-44wp-34gm","title":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to...","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T15:31:51Z","modified":"2026-06-30T15:31:38Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-178"],"updated_at":"2026-11-02T15:09:05.934873Z"}],"nvd":[{"id":"CVE-2025-4035","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T13:15:45.407Z","modified":"2026-11-05T16:17:17.71Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-178"],"updated_at":"2026-11-05T19:55:50.758755Z"}],"osv":[{"id":"DEBIAN-CVE-2025-4035","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T13:15:45.407Z","modified":"2026-10-31T16:02:11.633013131Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:46.998514Z"},{"id":"RHSA-2025:8128","title":"Red Hat Security Advisory: libsoup3 security update","status":"published","published":"2025-05-27T10:03:14Z","modified":"2026-07-01T10:09:34Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:17.634515Z"},{"id":"RLSA-2025:8128","title":"Important: libsoup3 security update","description":"Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages.  libsoup uses the Glib main loop and is designed to work well with GTK applications. This enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion, very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who want it), but the SOAP parts were removed long ago.\n\nSecurity Fix(es):\n\n* libsoup: Denial of Service attack to websocket server (CVE-2025-32049)\n\n* libsoup: Denial of service in server when client requests a large amount of  overlapping ranges with Range header (CVE-2025-32907)\n\n* libsoup: Cookie domain validation bypass via uppercase characters in libsoup (CVE-2025-4035)\n\n* libsoup: Integer Underflow in soup_multipart_new_from_message() Leading to Denial of Service in libsoup (CVE-2025-4948)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2025-10-03T19:56:45.27031Z","modified":"2025-10-08T17:12:40.742245Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:25.508922Z"},{"id":"UBUNTU-CVE-2025-4035","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T13:15:00Z","modified":"2026-11-10T02:50:17.012855941Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-10T03:18:47.929634Z"},{"id":"ALSA-2025:8128","title":"Important: libsoup3 security update","description":"Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. libsoup uses the Glib main loop and is designed to work well with GTK applications. This enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion, very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who want it), but the SOAP parts were removed long ago.  \n\nSecurity Fix(es):  \n\n  * libsoup: Denial of Service attack to websocket server (CVE-2025-32049)\n  * libsoup: Denial of service in server when client requests a large amount of overlapping ranges with Range header (CVE-2025-32907)\n  * libsoup: Cookie domain validation bypass via uppercase characters in libsoup (CVE-2025-4035)\n  * libsoup: Integer Underflow in soup_multipart_new_from_message() Leading to Denial of Service in libsoup (CVE-2025-4948)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2025-05-26T00:00:00Z","modified":"2026-10-29T11:30:12.120086104Z","updated_at":"2026-11-02T15:27:53.448565Z"},{"id":"AZL-61665","title":"CVE-2025-4035 affecting package libsoup 3.0.4-12","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T13:15:45Z","modified":"2026-04-21T04:31:48.950516Z","updated_at":"2026-11-02T15:28:07.805289Z"},{"id":"AZL-61670","title":"CVE-2025-4035 affecting package libsoup 3.4.4-18","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T13:15:45Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:21.344052Z"},{"id":"CVE-2025-4035","description":"A flaw was found in libsoup. When handling cookies, libsoup clients mistakenly allow cookies to be set for public suffix domains if the domain contains at least two components and includes an uppercase character. This bypasses public suffix protections and could allow a malicious website to set cookies for domains it does not own, potentially leading to integrity issues such as session fixation.","status":"published","published":"2025-04-29T13:15:45Z","modified":"2026-04-10T05:26:24.401078Z","updated_at":"2026-11-02T15:44:49.394967Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2025-4035","title":"CVE-2025-4035 in libsoup3 - Patched by Root","description":"Root has patched CVE-2025-4035 in the libsoup3 package for Root:Debian:13. Multiple fixed versions available.","status":"published","published":"2026-11-04T14:29:10Z","modified":"2026-11-04T15:15:09.575911793Z","updated_at":"2026-11-04T15:39:09.547857Z"}]}}