{"id":"CVE-2026-31814","aliases":["DEBIAN-CVE-2026-31814","EUVD-2026-12083","GHSA-4w32-2493-32g7","UBUNTU-CVE-2026-31814"],"status":"published","title":"Yamux remote Panic via malformed WindowUpdate credit","description":"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.","severity":{"version":"4.0","score":8.7,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0051,"percentile":0.44027,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-190"],"published":"2026-03-13T18:57:19Z","modified":"2026-11-09T02:47:19Z","fixes":[{"ecosystem":"crates.io","package":"yamux","fixed_in":["0.13.9"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"rust-yamux","fixed_in":["0.13.9+ds-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"crates.io","package":"yamux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.13.0"},{"fixed":"0.13.9"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"rust-yamux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.10+ds-1","0.13.10+ds-2","0.13.3-4","0.13.7-1","0.13.8-1","0.13.9+ds-1"]},{"source":"osv","ecosystem":"Debian:14","package":"rust-yamux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13.9+ds-1"}]}],"versions":["0.13.3-4","0.13.7-1","0.13.8-1"]},{"source":"osv","ecosystem":"crates.io","package":"yamux","ranges":[{"type":"SEMVER","events":[{"introduced":"0.13.0"},{"fixed":"0.13.9"}]}]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"rust-yamux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.3-4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"rust-yamux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.8-1","0.13.10+ds-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"rust-yamux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.3-4","0.13.7-1","0.13.8-1"]}],"products":[{"vendor":"libp2p","product":"rust-yamux"},{"vendor":"protocol","product":"yamux"}],"references":[{"url":"https://github.com/libp2p/rust-yamux/security/advisories/GHSA-4w32-2493-32g7","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/libp2p/rust-yamux/pull/221","tags":["web"]},{"url":"https://github.com/libp2p/rust-yamux/commit/b1aae09d60c0bd6a5915a5448f4e8cbc5174db53","tags":["web"]},{"url":"https://github.com/libp2p/rust-yamux/releases/tag/yamux-v0.13.9","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31814","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-4w32-2493-32g7"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31814.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-31814","tags":["advisory"]},{"url":"https://github.com/libp2p/rust-yamux","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-31814","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31814","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-31814","title":"Yamux remote Panic via malformed WindowUpdate credit","description":"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.","status":"published","published":"2026-03-13T19:19:41.879Z","modified":"2026-03-13T19:38:02.29Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:19:51.277563Z"}],"euvd":[{"id":"EUVD-2026-12083","description":"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.","status":"published","published":"2026-03-13T19:19:41Z","modified":"2026-03-13T19:38:02Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"updated_at":"2026-11-02T19:25:35.010093Z"}],"ghsa":[{"id":"GHSA-4w32-2493-32g7","title":"Yamux vulnerable to remote Panic via malformed WindowUpdate credit","description":"### Sumary\nThe Rust implementation of Yamux accepts `WindowUpdate` credit values from the remote peer and applies them to per-stream send-window state.  \nA 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.\n#### Attack Scenario  \nAn attacker that can establish a Yamux session with a target node can crash the target by sending two validly encoded Yamux frames:\n1. Open a stream (e.g. DATA + SYN) so the stream exists with initial send-window state (`DEFAULT_CREDIT`).\n2. Send a WindowUpdate on that stream with a very large credit value (e.g. 0xFFFF_0000) such that adding credit to the current send-window overflows u32.\n### Impact\nRemote unauthenticated denial of service.  \nAn attacker can repeatedly trigger panics by reconnecting and replaying the crafted frame sequence.\n### Patches\nUsers should upgrade to `yamux` `v0.13.9`\n\nThis vulnerability was originally submitted by @revofusion to the Ethereum Foundation bug bounty program","status":"published","published":"2026-03-13T18:57:19Z","modified":"2026-03-16T17:06:20Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:39:36.642723Z"}],"nvd":[{"id":"CVE-2026-31814","description":"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.","status":"published","published":"2026-03-13T19:54:36.47Z","modified":"2026-06-17T10:34:30.497Z","cvss":[{"version":"4.0","score":8.7,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:12:09.358914Z"}],"osv":[{"id":"CVE-2026-31814","title":"Yamux remote Panic via malformed WindowUpdate credit","description":"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.","status":"published","published":"2026-03-13T19:19:41.879Z","modified":"2026-11-09T02:47:19.771734794Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-190"],"updated_at":"2026-11-09T03:16:17.543303Z"},{"id":"DEBIAN-CVE-2026-31814","description":"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.","status":"published","published":"2026-03-13T19:54:36.47Z","modified":"2026-10-01T03:03:10.426202302Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:54.232518Z"},{"id":"GHSA-4w32-2493-32g7","title":"Yamux vulnerable to remote Panic via malformed WindowUpdate credit","description":"### Sumary\nThe Rust implementation of Yamux accepts `WindowUpdate` credit values from the remote peer and applies them to per-stream send-window state.  \nA 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.\n#### Attack Scenario  \nAn attacker that can establish a Yamux session with a target node can crash the target by sending two validly encoded Yamux frames:\n1. Open a stream (e.g. DATA + SYN) so the stream exists with initial send-window state (`DEFAULT_CREDIT`).\n2. Send a WindowUpdate on that stream with a very large credit value (e.g. 0xFFFF_0000) such that adding credit to the current send-window overflows u32.\n### Impact\nRemote unauthenticated denial of service.  \nAn attacker can repeatedly trigger panics by reconnecting and replaying the crafted frame sequence.\n### Patches\nUsers should upgrade to `yamux` `v0.13.9`\n\nThis vulnerability was originally submitted by @revofusion to the Ethereum Foundation bug bounty program","status":"published","published":"2026-03-13T18:57:19Z","modified":"2026-03-16T17:16:28.081446Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T15:46:37.528068Z"},{"id":"UBUNTU-CVE-2026-31814","description":"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.","status":"published","published":"2026-03-13T19:54:00Z","modified":"2026-10-17T12:58:50.241527829Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:11.640778Z"}]}}