{
    "document": {
        "category": "csaf_base",
        "csaf_version": "2.0",
        "distribution": {
            "tlp": {
                "label": "WHITE"
            }
        },
        "lang": "en",
        "notes": [
            {
                "category": "legal_disclaimer",
                "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
            }
        ],
        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-31814",
        "tracking": {
            "current_release_date": "2026-03-23T11:02:38.905988Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-31814",
            "initial_release_date": "2026-03-13T19:39:48.249783Z",
            "revision_history": [
                {
                    "date": "2026-03-13T19:39:48.249783Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-13T19:39:50.077022Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-13T19:51:05.808724Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (5).| CWES updated (1)."
                },
                {
                    "date": "2026-03-13T19:51:17.069477Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-13T20:31:21.119856Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-13T20:31:28.632001Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-13T20:38:51.600821Z",
                    "number": "7",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-03-14T07:35:39.196147Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-14T12:43:51.859880Z",
                    "number": "9",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source."
                },
                {
                    "date": "2026-03-14T14:52:05.142774Z",
                    "number": "10",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-14T14:52:12.043834Z",
                    "number": "11",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-16T17:45:20.369323Z",
                    "number": "12",
                    "summary": "References created (1)."
                },
                {
                    "date": "2026-03-16T17:45:29.909153Z",
                    "number": "13",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-19T15:28:45.704917Z",
                    "number": "14",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (6).| CWES updated (1)."
                },
                {
                    "date": "2026-03-19T15:28:47.962716Z",
                    "number": "15",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-19T20:30:27.811344Z",
                    "number": "16",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| Product Identifiers created (1).| Exploits created (1).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-19T20:30:31.176496Z",
                    "number": "17",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T09:32:50.062281Z",
                    "number": "18",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                }
            ],
            "status": "interim",
            "version": "18"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/>=0.13.0|<0.13.9",
                                "product": {
                                    "name": "vers:unknown/>=0.13.0|<0.13.9",
                                    "product_id": "CSAFPID-5825036"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "rust-yamux"
                    }
                ],
                "category": "vendor",
                "name": "libp2p"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/>=0.13.0|<0.13.9",
                                "product": {
                                    "name": "vers:unknown/>=0.13.0|<0.13.9",
                                    "product_id": "CSAFPID-5859080",
                                    "product_identification_helper": {
                                        "cpe": "cpe:2.3:a:protocol:yamux:*:*:*:*:*:rust:*:*"
                                    }
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "yamux"
                    }
                ],
                "category": "vendor",
                "name": "protocol"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-31814",
            "cwe": {
                "id": "CWE-190",
                "name": "Integer Overflow or Wraparound"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "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.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-31814"
                },
                {
                    "category": "description",
                    "text": "### 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",
                    "title": "github - https://github.com/advisories/GHSA-4w32-2493-32g7"
                },
                {
                    "category": "description",
                    "text": "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.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-31814"
                },
                {
                    "category": "description",
                    "text": "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.",
                    "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-31814"
                },
                {
                    "category": "description",
                    "text": "### 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",
                    "title": "github - https://api.github.com/advisories/GHSA-4w32-2493-32g7"
                },
                {
                    "category": "description",
                    "text": "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.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31814"
                },
                {
                    "category": "other",
                    "text": "0.00079",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "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",
                    "title": "CVSSV4"
                },
                {
                    "category": "other",
                    "text": "8.7",
                    "title": "CVSSV4 base score"
                },
                {
                    "category": "other",
                    "text": "3.4",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent CVSS (V3) score, Is related to (a version of) an uncommon product, Is related to an uncommon product vendor, There is exploit data available from source Nvd, The value of the most recent EPSS score",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5825036",
                    "CSAFPID-5859080"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-31814"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31814.json"
                },
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://github.com/advisories/GHSA-4w32-2493-32g7"
                },
                {
                    "category": "external",
                    "summary": "Source raw - github",
                    "url": "https://api.github.com/advisories/GHSA-4w32-2493-32g7"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31814"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31814"
                },
                {
                    "category": "external",
                    "summary": "Source - debian",
                    "url": "https://security-tracker.debian.org/tracker/CVE-2026-31814"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-31814"
                },
                {
                    "category": "external",
                    "summary": "Source raw - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://api.github.com/advisories/GHSA-4w32-2493-32g7"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31814"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd",
                    "url": "https://github.com/libp2p/rust-yamux/security/advisories/GHSA-4w32-2493-32g7"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/libp2p/rust-yamux/pull/221"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/libp2p/rust-yamux/commit/b1aae09d60c0bd6a5915a5448f4e8cbc5174db53"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/libp2p/rust-yamux/releases/tag/yamux-v0.13.9"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/advisories/GHSA-4w32-2493-32g7"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31814"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "products": [
                        "CSAFPID-5825036",
                        "CSAFPID-5859080"
                    ]
                }
            ],
            "title": "CVE-2026-31814"
        }
    ]
}