{"id":"DEBIAN-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":"2026-09-01T20:05:52.763565269Z","published":"2025-05-16T18:16:10.970Z","upstream":["CVE-2025-4476"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-4476"}],"affected":[{"package":{"name":"libsoup2.4","ecosystem":"Debian:12","purl":"pkg:deb/debian/libsoup2.4?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.74.3-1","2.74.3-1+deb12u1","2.74.3-10","2.74.3-10.1","2.74.3-11","2.74.3-2","2.74.3-3","2.74.3-3.1~exp1","2.74.3-3.1~exp2","2.74.3-3.1~exp3","2.74.3-5","2.74.3-6","2.74.3-7","2.74.3-8","2.74.3-8.1","2.74.3-9"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4476.json"}},{"package":{"name":"libsoup2.4","ecosystem":"Debian:13","purl":"pkg:deb/debian/libsoup2.4?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.74.3-10.1","2.74.3-11"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4476.json"}},{"package":{"name":"libsoup3","ecosystem":"Debian:12","purl":"pkg:deb/debian/libsoup3?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.2-2","3.2.3-0+deb12u1","3.2.3-0+deb12u2","3.3.1-1","3.4.0-1","3.4.1-1","3.4.2-1","3.4.2-2","3.4.2-3","3.4.2-4","3.4.3-1","3.4.4-1","3.4.4-2","3.4.4-3","3.4.4-4","3.4.4-5","3.5.2-1","3.6.0-1","3.6.0-2","3.6.0-3","3.6.0-4","3.6.1-1","3.6.4-1","3.6.4-2","3.6.4-3","3.6.5-1","3.6.5-2","3.6.5-3","3.6.5-4","3.6.5-5","3.6.5-6","3.6.5-7","3.6.5-8","3.6.5-9","3.6.6-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4476.json"}},{"package":{"name":"libsoup3","ecosystem":"Debian:13","purl":"pkg:deb/debian/libsoup3?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.5-2"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4476.json"}},{"package":{"name":"libsoup3","ecosystem":"Debian:14","purl":"pkg:deb/debian/libsoup3?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.5-2"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4476.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"}]}