{"id":"UBUNTU-CVE-2026-28525","details":"SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.","modified":"2026-05-27T19:15:14.310051743Z","published":"2026-04-23T21:16:00Z","upstream":["CVE-2026-28525"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-28525"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-28525"}],"affected":[{"package":{"name":"swupdate","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/swupdate?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2020.11-2","2021.04-1.1","2021.04-2","2021.04-2build1","2021.11-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libswupdate0.1","binary_version":"2021.11-1"},{"binary_name":"lua-swupdate","binary_version":"2021.11-1"},{"binary_version":"2021.11-1","binary_name":"swupdate"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28525.json"}},{"package":{"name":"swupdate","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/swupdate?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2023.05+dfsg-3","2023.05+dfsg-4","2023.05+dfsg-4build1","2023.05+dfsg-5","2023.12+dfsg-1","2023.12.1+dfsg-1ubuntu1","2023.12.1+dfsg-1ubuntu4","2023.12.1+dfsg-1ubuntu5"],"ecosystem_specific":{"binaries":[{"binary_version":"2023.12.1+dfsg-1ubuntu5","binary_name":"libswupdate0.1"},{"binary_version":"2023.12.1+dfsg-1ubuntu5","binary_name":"lua-swupdate"},{"binary_version":"2023.12.1+dfsg-1ubuntu5","binary_name":"swupdate"},{"binary_name":"swupdate-www","binary_version":"2023.12.1+dfsg-1ubuntu5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28525.json"}},{"package":{"name":"swupdate","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/swupdate?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2024.12.1+dfsg-1build2","2024.12.1+dfsg-2","2024.12.1+dfsg-3","2025.05+dfsg-2ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"2025.05+dfsg-2ubuntu1","binary_name":"libswupdate0.1"},{"binary_name":"lua-swupdate","binary_version":"2025.05+dfsg-2ubuntu1"},{"binary_name":"swupdate","binary_version":"2025.05+dfsg-2ubuntu1"},{"binary_name":"swupdate-www","binary_version":"2025.05+dfsg-2ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28525.json"}},{"package":{"name":"swupdate","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/swupdate?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2025.05+dfsg-2ubuntu1","2025.05+dfsg-3ubuntu1","2025.12+dfsg-1ubuntu1","2025.12+dfsg-2ubuntu1","2025.12+dfsg-3ubuntu1","2025.12+dfsg-4ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"2025.12+dfsg-4ubuntu1","binary_name":"libswupdate0.1"},{"binary_name":"lua-swupdate","binary_version":"2025.12+dfsg-4ubuntu1"},{"binary_version":"2025.12+dfsg-4ubuntu1","binary_name":"swupdate"},{"binary_name":"swupdate-www","binary_version":"2025.12+dfsg-4ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28525.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}