{"id":"UBUNTU-CVE-2025-4476","details":"A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.","modified":"2026-04-22T19:51:17.800863Z","published":"2025-05-16T18:16:00Z","related":["USN-7543-1"],"upstream":["CVE-2025-4476"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-4476"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-4476"},{"type":"REPORT","url":"https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/457"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2025-4476"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7543-1"}],"affected":[{"package":{"name":"libsoup2.4","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libsoup2.4@2.52.2-1ubuntu0.3+esm3?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.52.2-1ubuntu0.3+esm3"}]}],"versions":["2.50.0-2debian1","2.52.1-1","2.52.2-1","2.52.2-1ubuntu0.1","2.52.2-1ubuntu0.2","2.52.2-1ubuntu0.3","2.52.2-1ubuntu0.3+esm1","2.52.2-1ubuntu0.3+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.52.2-1ubuntu0.3+esm3","binary_name":"gir1.2-soup-2.4"},{"binary_version":"2.52.2-1ubuntu0.3+esm3","binary_name":"libsoup-gnome2.4-1"},{"binary_version":"2.52.2-1ubuntu0.3+esm3","binary_name":"libsoup2.4-1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4476.json"}},{"package":{"name":"libsoup2.4","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libsoup2.4@2.62.1-1ubuntu0.4+esm4?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.62.1-1ubuntu0.4+esm4"}]}],"versions":["2.60.1-1","2.60.2-1","2.60.2-2","2.60.3-1","2.61.90-1","2.62.0-1","2.62.1-1","2.62.1-1ubuntu0.1","2.62.1-1ubuntu0.3","2.62.1-1ubuntu0.4","2.62.1-1ubuntu0.4+esm1","2.62.1-1ubuntu0.4+esm2","2.62.1-1ubuntu0.4+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.62.1-1ubuntu0.4+esm4","binary_name":"gir1.2-soup-2.4"},{"binary_version":"2.62.1-1ubuntu0.4+esm4","binary_name":"libsoup-gnome2.4-1"},{"binary_version":"2.62.1-1ubuntu0.4+esm4","binary_name":"libsoup2.4-1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4476.json"}},{"package":{"name":"libsoup2.4","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libsoup2.4@2.70.0-1ubuntu0.5?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.70.0-1ubuntu0.5"}]}],"versions":["2.68.2-0ubuntu1","2.68.2-1","2.68.2-2","2.68.2-2build2","2.69.90-1","2.70.0-1","2.70.0-1ubuntu0.1","2.70.0-1ubuntu0.2","2.70.0-1ubuntu0.3","2.70.0-1ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.70.0-1ubuntu0.5","binary_name":"gir1.2-soup-2.4"},{"binary_version":"2.70.0-1ubuntu0.5","binary_name":"libsoup-gnome2.4-1"},{"binary_version":"2.70.0-1ubuntu0.5","binary_name":"libsoup2.4-1"},{"binary_version":"2.70.0-1ubuntu0.5","binary_name":"libsoup2.4-tests"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4476.json"}},{"package":{"name":"libsoup2.4","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libsoup2.4@2.74.2-3ubuntu0.5?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.74.2-3ubuntu0.5"}]}],"versions":["2.72.0-3ubuntu3","2.74.1-1","2.74.2-2","2.74.2-3","2.74.2-3ubuntu0.1","2.74.2-3ubuntu0.2","2.74.2-3ubuntu0.3","2.74.2-3ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.74.2-3ubuntu0.5","binary_name":"gir1.2-soup-2.4"},{"binary_version":"2.74.2-3ubuntu0.5","binary_name":"libsoup-gnome2.4-1"},{"binary_version":"2.74.2-3ubuntu0.5","binary_name":"libsoup2.4-1"},{"binary_version":"2.74.2-3ubuntu0.5","binary_name":"libsoup2.4-common"},{"binary_version":"2.74.2-3ubuntu0.5","binary_name":"libsoup2.4-tests"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4476.json"}},{"package":{"name":"libsoup3","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/libsoup3@3.0.7-0ubuntu1+esm4?arch=source&distro=esm-apps/jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.7-0ubuntu1+esm4"}]}],"versions":["3.0.4-2","3.0.4-3","3.0.5-1","3.0.7-0ubuntu1","3.0.7-0ubuntu1+esm1","3.0.7-0ubuntu1+esm2","3.0.7-0ubuntu1+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0.7-0ubuntu1+esm4","binary_name":"gir1.2-soup-3.0"},{"binary_version":"3.0.7-0ubuntu1+esm4","binary_name":"libsoup-3.0-0"},{"binary_version":"3.0.7-0ubuntu1+esm4","binary_name":"libsoup-3.0-common"},{"binary_version":"3.0.7-0ubuntu1+esm4","binary_name":"libsoup-3.0-tests"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4476.json"}},{"package":{"name":"libsoup2.4","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libsoup2.4@2.74.3-6ubuntu1.5?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.74.3-6ubuntu1.5"}]}],"versions":["2.74.3-1","2.74.3-2","2.74.3-3","2.74.3-6","2.74.3-6build1","2.74.3-6ubuntu1","2.74.3-6ubuntu1.1","2.74.3-6ubuntu1.2","2.74.3-6ubuntu1.3","2.74.3-6ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.74.3-6ubuntu1.5","binary_name":"gir1.2-soup-2.4"},{"binary_version":"2.74.3-6ubuntu1.5","binary_name":"libsoup-2.4-1"},{"binary_version":"2.74.3-6ubuntu1.5","binary_name":"libsoup-gnome-2.4-1"},{"binary_version":"2.74.3-6ubuntu1.5","binary_name":"libsoup2.4-common"},{"binary_version":"2.74.3-6ubuntu1.5","binary_name":"libsoup2.4-tests"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4476.json"}},{"package":{"name":"libsoup3","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libsoup3@3.4.4-5ubuntu0.4?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.4-5ubuntu0.4"}]}],"versions":["3.4.2-4","3.4.4-1","3.4.4-2","3.4.4-4","3.4.4-5","3.4.4-5build1","3.4.4-5build2","3.4.4-5ubuntu0.1","3.4.4-5ubuntu0.2","3.4.4-5ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_version":"3.4.4-5ubuntu0.4","binary_name":"gir1.2-soup-3.0"},{"binary_version":"3.4.4-5ubuntu0.4","binary_name":"libsoup-3.0-0"},{"binary_version":"3.4.4-5ubuntu0.4","binary_name":"libsoup-3.0-common"},{"binary_version":"3.4.4-5ubuntu0.4","binary_name":"libsoup-3.0-tests"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4476.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}