{"id":"CVE-2026-2708","title":"Libsoup: libsoup: http request smuggling via duplicate content-length headers","summary":"A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for dupli…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-444"],"vendor":"Red Hat","product":"libsoup3","affected":["libsoup3 (all versions)","libsoup (all versions)","libsoup (all versions)","libsoup (all versions)","libsoup (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-04-24T14:53:37.912115Z"},"published":"2026-04-23","updated":"2026-11-06","sourceUpdated":"2026-11-06T18:23:22.965Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-2708","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-2708"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2440743","label":"RHBZ#2440743"},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/500"},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/513"}],"tags":["cve.org"],"epss":0.00321,"epssPercentile":0.25291,"ingestedAt":"2026-11-06T19:01:36.637Z","slug":"CVE-2026-2708","body":"## Overview\n\nA request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for duplicate or conflicting Content-Length fields. This allows an attacker to send HTTP requests containing multiple Content-Length headers with differing values.\n\n## Affected\n\n- `libsoup3 (all versions)`\n- `libsoup (all versions)`\n- `libsoup (all versions)`\n- `libsoup (all versions)`\n- `libsoup (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}