{"id":"UBUNTU-CVE-2026-31814","details":"Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. From 0.13.0 to before 0.13.9, a specially crafted WindowUpdate can cause arithmetic overflow in send-window accounting, which triggers a panic in the connection state machine. This is remotely reachable over a normal network connection and does not require authentication. This vulnerability is fixed in 0.13.9.","modified":"2026-05-20T16:25:16.601910092Z","published":"2026-03-13T19:54:00Z","upstream":["CVE-2026-31814"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-31814"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-31814"},{"type":"REPORT","url":"https://github.com/libp2p/rust-yamux/security/advisories/GHSA-4w32-2493-32g7"}],"affected":[{"package":{"name":"rust-yamux","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/rust-yamux?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.3-4"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-yamux-dev","binary_version":"0.13.3-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-31814.json"}},{"package":{"name":"rust-yamux","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-yamux?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.3-4","0.13.7-1","0.13.8-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-yamux-dev","binary_version":"0.13.8-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-31814.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}