{"id":"CVE-2026-3633","title":"Libsoup: libsoup: header and http request injection via crlf injection","summary":"A flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()` function, could inject arbitrary headers and additional request data. This vulnerability, known as CRLF (Carriage Return Line…","severity":"low","cvss":3.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L","cvssSource":"cna","cwe":["CWE-93"],"vendor":"Red Hat","product":"libsoup3","affected":["libsoup3 (all versions)","libsoup","libsoup (all versions)","libsoup (all versions)","libsoup (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-03-17T12:59:46.420116Z"},"published":"2026-03-17","updated":"2026-11-03","sourceUpdated":"2026-11-03T04:04:44.469Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-3633","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-3633"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2445128","label":"RHBZ#2445128"},{"url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/484"}],"tags":["cve.org"],"epss":0.00237,"epssPercentile":0.14871,"ingestedAt":"2026-11-05T19:30:42.889Z","slug":"CVE-2026-3633","body":"## Overview\n\nA flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()` function, could inject arbitrary headers and additional request data. This vulnerability, known as CRLF (Carriage Return Line Feed) injection, occurs because the method value is not properly escaped during request line construction, potentially leading to HTTP request injection.\n\n## Affected\n\n- `libsoup3 (all versions)`\n- `libsoup`\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.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":21,"depthScoreParts":{"impact":21.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}