{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-120251",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-10-31T22:06:00.527Z",
        "datePublished": "2026-11-01T00:57:14.911Z",
        "dateUpdated": "2026-11-01T00:57:14.911Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
                "shortName": "VulnCheck",
                "dateUpdated": "2026-11-01T00:57:14.911Z"
            },
            "datePublic": "2026-10-10T00:00:00.000Z",
            "title": "imagecodecs 2026.3.6 through 2026.10.10 Infinite Loop via ccittfax4_decode()",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Loop with Unreachable Exit Condition ('Infinite Loop')",
                            "cweId": "CWE-835",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "cgohlke",
                    "product": "imagecodecs",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "2026.3.6",
                            "lessThanOrEqual": "2026.10.10",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ],
                    "packageURL": "pkg:pypi/imagecodecs",
                    "repo": "https://github.com/cgohlke/imagecodecs"
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "cvssV4_0": {
                        "version": "4.0",
                        "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "attackVector": "LOCAL",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 6.8,
                        "baseSeverity": "MEDIUM"
                    }
                },
                {
                    "format": "CVSS",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                        "attackVector": "LOCAL",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "REQUIRED",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH",
                        "baseScore": 5.5,
                        "baseSeverity": "MEDIUM"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://github.com/cgohlke/imagecodecs/issues/158",
                    "tags": [
                        "issue-tracking"
                    ],
                    "name": "GitHub Issue #158"
                },
                {
                    "url": "https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/ccitt/ccitt.c#L1449",
                    "tags": [
                        "technical-description"
                    ]
                },
                {
                    "url": "https://github.com/cgohlke/imagecodecs",
                    "tags": [
                        "product"
                    ]
                },
                {
                    "name": "VulnCheck Advisory: imagecodecs 2026.3.6 through 2026.10.10 Infinite Loop via ccittfax4_decode()",
                    "tags": [
                        "third-party-advisory"
                    ],
                    "url": "https://www.vulncheck.com/advisories/imagecodecs-2026.3.6-through-2026.10.10-infinite-loop-via-ccittfax4-decode"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Dilanka Kaushal Hewage (r3vpwnx)",
                    "type": "finder"
                }
            ],
            "x_generator": {
                "engine": "vulncheck-endgame"
            }
        }
    }
}