{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-77399",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-08-20T19:55:27.023Z",
        "datePublished": "2026-09-22T18:58:56.647Z",
        "dateUpdated": "2026-09-23T14:36:47.671Z"
    },
    "containers": {
        "cna": {
            "title": "icalendar: Denial of service via unbounded VALARM REPEAT expansion",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-400",
                            "lang": "en",
                            "description": "CWE-400: Uncontrolled Resource Consumption",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-834",
                            "lang": "en",
                            "description": "CWE-834: Excessive Iteration",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "LOW",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/collective/icalendar/security/advisories/GHSA-qjcq-q7h7-r74v",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/collective/icalendar/security/advisories/GHSA-qjcq-q7h7-r74v"
                },
                {
                    "name": "https://github.com/collective/icalendar/pull/1571",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/collective/icalendar/pull/1571"
                },
                {
                    "name": "https://github.com/collective/icalendar/commit/157f85137c65565a308bbcf4fdcc7d8ebce01267",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/collective/icalendar/commit/157f85137c65565a308bbcf4fdcc7d8ebce01267"
                },
                {
                    "name": "https://github.com/collective/icalendar/commit/cddd37226adbc52cca52a399f61d38a378221219",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/collective/icalendar/commit/cddd37226adbc52cca52a399f61d38a378221219"
                },
                {
                    "name": "https://github.com/collective/icalendar/releases/tag/v7.2.2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/collective/icalendar/releases/tag/v7.2.2"
                }
            ],
            "affected": [
                {
                    "vendor": "collective",
                    "product": "icalendar",
                    "versions": [
                        {
                            "version": ">= 6.1.0, < 7.2.2",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-22T18:58:56.647Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 6.1.0 until 7.2.2, vInt.from_ical accepts an attacker-controlled VALARM REPEAT value and applications that request alarm times can eagerly expand it without an application-level limit. Alarms.times and Alarms.active reach the unbounded expansion in versions starting with 6.1.0, while Alarm.triggers adds a second affected path starting with 7.0.0. Parsing alone does not trigger the issue, but accessing these properties can consume excessive CPU time and heap memory and terminate or stall a service. This issue is fixed in version 7.2.2."
                }
            ],
            "source": {
                "advisory": "GHSA-qjcq-q7h7-r74v",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-23T14:10:14.416349Z",
                                "id": "CVE-2026-77399",
                                "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": "2026-09-23T14:36:47.671Z"
                }
            }
        ]
    }
}