{"id":"CVE-2026-85534","aliases":["AZL-99912","DEBIAN-CVE-2026-85534","EUVD-2026-70997","GHSA-qm5f-xr9c-mm27","SUSE-SU-2026:23848-1","SUSE-SU-2026:23857-1","SUSE-SU-2026:23866-1","SUSE-SU-2026:23875-1","SUSE-SU-2026:23923-1","SUSE-SU-2026:4273-1","SUSE-SU-2026:4274-1","UBUNTU-CVE-2026-85534","USN-8890-1","USN-8890-2","openSUSE-SU-2026:11823-1","openSUSE-SU-2026:21901-1"],"status":"published","title":"Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initial_window_size shrinks during deferred body read","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. 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9"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-85534","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528440","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/blob/master/libsoup/http2/soup-client-message-io-http2.c"},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/work_items/551","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85534","tags":["web"]},{"url":"https://github.com/advisories/GHSA-qm5f-xr9c-mm27"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-85534","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623848-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1279238","tags":["report"]},{"url":"https://bugzilla.suse.com/1279239","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-85197","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-85534","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623857-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623866-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623875-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623923-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264273-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264274-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-85534","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-85534","tags":["report"]},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/561","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-2026-6324","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":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-85534","title":"Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initial_window_size shrinks during deferred body read","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.","status":"published","published":"2026-09-04T10:19:22.562Z","modified":"2026-11-06T01:08:18.145Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-617"],"updated_at":"2026-11-06T02:55:55.947181Z"}],"euvd":[{"id":"EUVD-2026-70997","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.","status":"published","published":"2026-09-04T10:19:22Z","modified":"2026-11-06T01:08:18Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-06T02:02:53.341523Z"}],"ghsa":[{"id":"GHSA-qm5f-xr9c-mm27","title":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input...","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.","status":"published","published":"2026-09-04T12:30:56Z","modified":"2026-09-04T12:31:01Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T15:11:21.957806Z"}],"nvd":[{"id":"CVE-2026-85534","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.","status":"published","published":"2026-09-04T11:17:19.627Z","modified":"2026-11-06T01:17:59.933Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-617"],"updated_at":"2026-11-06T06:59:05.303911Z"}],"osv":[{"id":"DEBIAN-CVE-2026-85534","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.","status":"published","published":"2026-09-04T11:17:19.627Z","modified":"2026-10-31T16:01:17.21813374Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:46:05.022702Z"},{"id":"UBUNTU-CVE-2026-85534","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.","status":"published","published":"2026-09-04T11:17:00Z","modified":"2026-10-22T04:41:54.118981837Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:57:24.828975Z"},{"id":"AZL-99912","title":"CVE-2026-85534 affecting package libsoup 3.4.4-18","description":"A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.","status":"published","published":"2026-09-04T11:17:19Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:26.480138Z"},{"id":"openSUSE-SU-2026:11823-1","title":"libsoup-3_0-0-3.6.6-9.1 on GA media","description":"These are all security issues fixed in the libsoup-3_0-0-3.6.6-9.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-19T00:00:00Z","modified":"2026-09-20T16:15:03.277430095Z","updated_at":"2026-11-02T16:58:39.516824Z"},{"id":"openSUSE-SU-2026:21901-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-21T12:40:20Z","modified":"2026-09-25T18:23:12.4322801Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:23848-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-21T12:40:18Z","modified":"2026-09-23T09:15:04.891687446Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:23857-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-21T12:40:18Z","modified":"2026-09-27T18:23:16.245248353Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:23866-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-21T12:40:18Z","modified":"2026-09-27T18:23:16.642003883Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:23875-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-18T09:16:04Z","modified":"2026-09-28T18:23:12.587990085Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:23923-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-18T07:07:43Z","modified":"2026-09-30T18:23:13.083279432Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:4273-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-21T07:30:37Z","modified":"2026-09-21T17:15:07.379154305Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:4274-1","title":"Security update for libsoup","description":"This update for libsoup fixes the following issues:\n\n- CVE-2026-85197: heap use-after-free in HTTP/2 `client on_data_read()` via `GOAWAY` during body upload (bsc#1279238).\n- CVE-2026-85534: heap buffer overflow in `SoupSession` through `on_data_source_read_callback()` via `SETTINGS` frame\n  with crafted `INITIAL_WINDOW_SIZE` (bsc#1279239).\n","status":"published","published":"2026-09-21T07:31:25Z","modified":"2026-09-21T17:15:07.38733936Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"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"}]}}