{"id":"CVE-2026-32314","aliases":["GHSA-vxx9-2994-q338"],"url":"https://o3.security/vulnerability/CVE-2026-32314","summary":"Yamux remote Panic via malformed Data frame with SYN set and len = 262145","details":"### Summary\nThe Rust implementation of Yamux can panic when processing a crafted inbound Data frame that sets SYN and uses a body length greater than DEFAULT_CREDIT (e.g. 262145).\nOn the first packet of a new inbound stream, stream state is created and a receiver is queued before oversized-body validation completes. When validation fails, the temporary stream is dropped and cleanup may call remove(...).expect(\"stream not found\"), triggering a panic in the connection state machine.\nThis is remotely reachable over a normal Yamux session and does not require authentication. kind of vulnerability is it? Who is \n#### Attack Scenario  \nAn attacker that can establish a Yamux session with a target node can crash the target by sending a single validly encoded Yamux Data|SYN frame with an oversized body:\n1. Establish a standard authenticated transport session that negotiates Yamux.\n2. Send one Yamux frame with:\n   - Tag = Data\n   - Flags = SYN\n   - StreamId = 1 (or any new inbound stream id)\n   - Length = DEFAULT_CREDIT + 1 (e.g. 262145)\n   - Body of matching size\nThis can trigger a panic (stream not found) and terminate the process, depending on host application panic policy.\n### Patches\nUsers should upgrade to `yamux` `v0.13.10`\n\nThis vulnerability was originally submitted by @revofusion to the Ethereum Foundation bug bounty program","published":"2026-03-13T19:53:08.823Z","modified":"2026-04-10T05:42:22.922566Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"yamux","fixedVersion":"0.13.10"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32314.json"},{"type":"ADVISORY","url":"https://github.com/libp2p/rust-yamux/security/advisories/GHSA-vxx9-2994-q338"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32314"},{"type":"PACKAGE","url":"https://github.com/libp2p/rust-yamux"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-04-10T05:42:22.922566Z"}}