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    "cveMetadata": {
        "cveId": "CVE-2026-8295",
        "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "state": "PUBLISHED",
        "assignerShortName": "CERT-PL",
        "dateReserved": "2026-05-11T09:30:25.123Z",
        "datePublished": "2026-05-14T10:27:41.953Z",
        "dateUpdated": "2026-05-14T17:48:38.036Z"
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                    "modules": [
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                    "platforms": [
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                    ],
                    "product": "simdjson",
                    "programFiles": [
                        "include/simdjson/generic/builder/json_string_builder-inl.h"
                    ],
                    "repo": "https://github.com/simdjson/simdjson",
                    "vendor": "simdjson",
                    "versions": [
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                            "lessThan": "4.6.4",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
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                    ]
                }
            ],
            "credits": [
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                    "lang": "en",
                    "type": "finder",
                    "value": "Michał Majchrowicz (AFINE)"
                },
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Marcin Wyczechowski (AFINE)"
                }
            ],
            "datePublic": "2026-05-14T10:27:00.000Z",
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                    "lang": "en",
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                            "value": "An integer overflow vulnerability in the simdjson document-builder API allows incorrect buffer size calculations in \"string_builder::escape_and_append()\" when processing very large input strings on platforms with limited \"size_t\" width (e.g., 32-bit builds). The overflow can cause insufficient buffer allocation, leading to out-of-bounds memory reads in SIMD routines and potentially resulting in information disclosure, memory corruption, or malformed JSON output.<br>This vulnerability has been fixed in&nbsp;4.6.4 release<br><br>"
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                }
            ],
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                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "attackVector": "NETWORK",
                        "baseScore": 6.9,
                        "baseSeverity": "MEDIUM",
                        "privilegesRequired": "NONE",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "NONE",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
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                            "value": "GENERAL"
                        }
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            ],
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                {
                    "descriptions": [
                        {
                            "cweId": "CWE-190",
                            "description": "CWE-190 Integer Overflow or Wraparound",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
                "shortName": "CERT-PL",
                "dateUpdated": "2026-05-14T10:27:41.953Z"
            },
            "references": [
                {
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://github.com/simdjson/simdjson/releases/tag/v4.6.4"
                },
                {
                    "tags": [
                        "third-party-advisory"
                    ],
                    "url": "https://cert.pl/posts/2026/05/CVE-2026-8295"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "tags": [
                "x_open-source"
            ],
            "title": "Integer overflow in simdjson",
            "x_generator": {
                "engine": "Vulnogram 0.2.0"
            }
        },
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            {
                "metrics": [
                    {
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                            "type": "ssvc",
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                                "timestamp": "2026-05-14T17:48:20.702107Z",
                                "id": "CVE-2026-8295",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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