{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-27572",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-02-20T17:40:28.448Z",
        "datePublished": "2026-02-24T21:31:50.186Z",
        "dateUpdated": "2026-02-27T20:55:29.879Z"
    },
    "containers": {
        "cna": {
            "title": "Wasmtime can panic when adding excessive fields to a `wasi:http/types.fields` instance",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-770",
                            "lang": "en",
                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "LOW",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "HIGH",
                        "baseScore": 6.9,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-243v-98vx-264h"
                },
                {
                    "name": "https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bytecodealliance/wasmtime/commit/301dc7162cca51def19131019af1187f45901c0a"
                },
                {
                    "name": "https://docs.rs/http/1.4.0/http/header/#limitations",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://docs.rs/http/1.4.0/http/header/#limitations"
                },
                {
                    "name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.6"
                },
                {
                    "name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.6"
                },
                {
                    "name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4"
                },
                {
                    "name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4"
                }
            ],
            "affected": [
                {
                    "vendor": "bytecodealliance",
                    "product": "wasmtime",
                    "versions": [
                        {
                            "version": "< 24.0.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 25.0.0, < 36.0.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 37.0.0, < 40.0.4",
                            "status": "affected"
                        },
                        {
                            "version": ">= 41.0.0, < 41.0.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-02-24T21:31:50.186Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of the `wasi:http/types.fields` resource is susceptible to panics when too many fields are added to the set of headers. Wasmtime's implementation in the `wasmtime-wasi-http` crate is backed by a data structure which panics when it reaches excessive capacity and this condition was not handled gracefully in Wasmtime. Panicking in a WASI implementation is a Denial of Service vector for embedders and is treated as a security vulnerability in Wasmtime. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 patch this vulnerability and return a trap to the guest instead of panicking. There are no known workarounds at this time. Embedders are encouraged to update to a patched version of Wasmtime."
                }
            ],
            "source": {
                "advisory": "GHSA-243v-98vx-264h",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-02-27T20:55:20.616278Z",
                                "id": "CVE-2026-27572",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-02-27T20:55:29.879Z"
                }
            }
        ]
    }
}