{"id":"GHSA-4w32-2493-32g7","summary":"Yamux vulnerable to remote Panic via malformed WindowUpdate credit","details":"### 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","aliases":["CVE-2026-31814"],"modified":"2026-03-16T17:16:28.081446Z","published":"2026-03-13T18:57:19Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-03-13T18:57:19Z","nvd_published_at":"2026-03-13T19:54:36Z","cwe_ids":["CWE-190"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/libp2p/rust-yamux/security/advisories/GHSA-4w32-2493-32g7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31814"},{"type":"WEB","url":"https://github.com/libp2p/rust-yamux/pull/221"},{"type":"WEB","url":"https://github.com/libp2p/rust-yamux/commit/b1aae09d60c0bd6a5915a5448f4e8cbc5174db53"},{"type":"PACKAGE","url":"https://github.com/libp2p/rust-yamux"},{"type":"WEB","url":"https://github.com/libp2p/rust-yamux/releases/tag/yamux-v0.13.9"}],"affected":[{"package":{"name":"yamux","ecosystem":"crates.io","purl":"pkg:cargo/yamux"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.13.0"},{"fixed":"0.13.9"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4w32-2493-32g7/GHSA-4w32-2493-32g7.json"}}],"schema_version":"1.9.0","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"}]}