{"id":"CVE-2026-6324","aliases":["AZL-89304","DEBIAN-CVE-2026-6324","EUVD-2026-33249","GHSA-2637-3gxc-qg4f","OESA-2026-2615","OESA-2026-2616","OESA-2026-2617","OESA-2026-2618","UBUNTU-CVE-2026-6324","USN-8890-1","USN-8890-2"],"status":"published","title":"Libsoup: libsoup: http request smuggling via unsigned to signed conversion error","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01315,"percentile":0.70947,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2026-05-29T05:24:07Z","modified":"2026-11-05T22:18:52Z","fixes":[{"ecosystem":"Azure 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9"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-6324","tags":["vdb-entry","x_refsource_REDHAT","advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458479","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/commit/96ac392b444d01bd5de1d1276b187c3ed49d048c","tags":["fix","report"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/508","tags":["report"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/work_items/508","tags":["exploit","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6324","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-2637-3gxc-qg4f"},{"url":"https://access.redhat.com/downloads/content/package-browser/","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6324.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-6324","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2615","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2616","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2617","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-32049","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2618","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-6324","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6324","tags":["report"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/517","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8890-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8890-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-4271","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-5119","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-66339","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-77014","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-77680","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-85197","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-85534","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-6324","title":"Libsoup: libsoup: http request smuggling via unsigned to signed conversion error","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T05:24:07.364Z","modified":"2026-11-05T21:51:04.201Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-05T22:55:20.139479Z"}],"euvd":[{"id":"EUVD-2026-33249","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T05:24:07Z","modified":"2026-11-05T21:51:04Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-05T23:02:19.769742Z"}],"ghsa":[{"id":"GHSA-2637-3gxc-qg4f","title":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion...","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T07:20:06Z","modified":"2026-11-03T03:30:21Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-444"],"updated_at":"2026-11-03T17:59:55.458475Z"}],"nvd":[{"id":"CVE-2026-6324","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T07:16:14.327Z","modified":"2026-11-05T22:18:52.62Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-05T23:57:17.922269Z"}],"osv":[{"id":"CVE-2026-6324","title":"Libsoup: libsoup: http request smuggling via unsigned to signed conversion error","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T05:24:07.364Z","modified":"2026-11-07T07:06:32.69616299Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-444"],"updated_at":"2026-11-07T03:08:08.50782Z"},{"id":"DEBIAN-CVE-2026-6324","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T07:16:14.327Z","modified":"2026-11-03T09:47:34.356975668Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T10:27:58.933618Z"},{"id":"OESA-2026-2615","title":"libsoup security update","description":"libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.(CVE-2026-6324)","status":"published","published":"2026-06-12T11:11:33Z","modified":"2026-08-18T01:20:04.087407766Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"OESA-2026-2616","title":"libsoup security update","description":"libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.(CVE-2026-6324)","status":"published","published":"2026-06-12T11:11:33Z","modified":"2026-08-18T01:20:03.704105503Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"OESA-2026-2617","title":"libsoup security update","description":"libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libsoup. The SoupWebsocketConnection may accept a large WebSocket message, which may cause libsoup to allocate memory and lead to a denial of service (DoS).(CVE-2025-32049)\n\nA flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.(CVE-2026-6324)","status":"published","published":"2026-06-12T11:11:33Z","modified":"2026-08-18T01:20:03.682538237Z","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":"2026-11-02T15:52:46.449097Z"},{"id":"OESA-2026-2618","title":"libsoup security update","description":"libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libsoup. The SoupWebsocketConnection may accept a large WebSocket message, which may cause libsoup to allocate memory and lead to a denial of service (DoS).(CVE-2025-32049)\n\nA flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.(CVE-2026-6324)","status":"published","published":"2026-06-12T11:11:33Z","modified":"2026-08-18T01:20:03.698383522Z","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":"2026-11-02T15:52:46.449097Z"},{"id":"UBUNTU-CVE-2026-6324","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T07:16:00Z","modified":"2026-11-03T21:19:35.730991543Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T21:43:19.823946Z"},{"id":"AZL-89304","title":"CVE-2026-6324 affecting package libsoup for versions less than 3.4.4-16","description":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","status":"published","published":"2026-05-29T07:16:14Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:25.436971Z"},{"id":"USN-8890-1","title":"libsoup2.4, libsoup3 vulnerabilities","description":"It was discovered that libsoup incorrectly handled certain HTTP/2 requests.\nA remote attacker could possibly use this issue to cause a denial of\nservice. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.\n(CVE-2026-4271)\n\nIt was discovered that libsoup incorrectly handled certain HTTPS proxy\nconnections. A remote attacker could possibly use this issue to obtain\nsensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu\n24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-5119)\n\nIt was discovered that libsoup incorrectly parsed certain chunked HTTP\nrequests. A remote attacker could possibly use this issue to bypass\nsecurity controls. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04\nLTS, and Ubuntu 26.04 LTS. (CVE-2026-6324)\n\nIt was discovered that libsoup incorrectly handled proxy authentication\ncredentials. A remote attacker could possibly use this issue to obtain\nsensitive information. (CVE-2026-66339)\n\nIt was discovered that libsoup incorrectly handled certain HTTP Range\nheaders. A remote attacker could possibly use this issue to cause a denial\nof service. (CVE-2026-77014, CVE-2026-77680)\n\nIt was discovered that libsoup incorrectly handled certain HTTP/2\nconnections. A remote attacker could possibly use this issue to obtain\nsensitive information or execute arbitrary code. This issue only affected\nUbuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-85197)\n\nIt was discovered that libsoup incorrectly handled certain HTTP/2\ntransfers. A remote attacker could possibly use this issue to cause a\ndenial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04\nLTS, and Ubuntu 26.04 LTS. (CVE-2026-85534)","status":"published","published":"2026-10-06T16:43:00Z","modified":"2026-10-07T04:42:35.653719001Z","updated_at":"2026-11-02T16:58:26.907654Z"},{"id":"USN-8890-2","title":"libsoup3 vulnerabilities","description":"USN-8890-1 fixed vulnerabilities in libsoup. This update provides the\ncorresponding updates for libsoup3 on Ubuntu 26.10.\n\nOriginal advisory details:\n\n It was discovered that libsoup incorrectly handled certain HTTP/2\n requests.\n A remote attacker could possibly use this issue to cause a denial of\n service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.\n (CVE-2026-4271)\n\n It was discovered that libsoup incorrectly handled certain HTTPS proxy\n connections. A remote attacker could possibly use this issue to obtain\n sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu\n 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-5119)\n\n It was discovered that libsoup incorrectly parsed certain chunked HTTP\n requests. A remote attacker could possibly use this issue to bypass\n security controls. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04\n LTS, and Ubuntu 26.04 LTS. (CVE-2026-6324)\n\n It was discovered that libsoup incorrectly handled proxy authentication\n credentials. A remote attacker could possibly use this issue to obtain\n sensitive information. (CVE-2026-66339)\n\n It was discovered that libsoup incorrectly handled certain HTTP Range\n headers. A remote attacker could possibly use this issue to cause a denial\n of service. (CVE-2026-77014, CVE-2026-77680)\n\n It was discovered that libsoup incorrectly handled certain HTTP/2\n connections. A remote attacker could possibly use this issue to obtain\n sensitive information or execute arbitrary code. This issue only affected\n Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-85197)\n\n It was discovered that libsoup incorrectly handled certain HTTP/2\n transfers. A remote attacker could possibly use this issue to cause a\n denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04\n LTS, and Ubuntu 26.04 LTS. (CVE-2026-85534)","status":"published","published":"2026-10-21T21:36:06Z","modified":"2026-10-22T04:42:59.625486789Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}