{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6103", "assignerOrgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b", "state": "PUBLISHED", "assignerShortName": "php", "dateReserved": "2026-04-11T04:13:04.238Z", "datePublished": "2026-09-25T20:08:49.333Z", "dateUpdated": "2026-09-25T20:41:27.115Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b", "shortName": "php", "dateUpdated": "2026-09-25T20:21:07.070Z"}, "title": "Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-190", "description": "CWE-190 Integer overflow or wraparound", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-92", "descriptions": [{"lang": "en", "value": "CAPEC-92 Forced Integer Overflow"}]}], "affected": [{"vendor": "PHP Group", "product": "PHP", "versions": [{"status": "affected", "version": "8.2.*", "lessThan": "8.2.34", "versionType": "semver"}, {"status": "affected", "version": "8.3.*", "lessThan": "8.3.35", "versionType": "semver"}, {"status": "affected", "version": "8.4.*", "lessThan": "8.4.26", "versionType": "semver"}, {"status": "affected", "version": "8.5.*", "lessThan": "8.5.11", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check. The field is 11 octal digits wide and holds values up to 0x1FFFFFFFF, so a size above 0xFFFFFFFF silently wraps. The parser then skips the wrong number of data blocks and interprets attacker-controlled file content as the next TAR header, which lets a crafted archive inject entries that PharData reports and extracts as if they were genuine.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p><code>phar_tar_number()</code> parses the octal size field of a TAR header into a <code>uint32_t</code> with no overflow check. The field is 11 octal digits wide and holds values up to <code>0x1FFFFFFFF</code>, so a size above <code>0xFFFFFFFF</code> silently wraps. The parser then skips the wrong number of data blocks and interprets attacker-controlled file content as the next TAR header, which lets a crafted archive inject entries that <code>PharData</code> reports and extracts as if they were genuine.</p>"}]}], "references": [{"url": "https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 4.3, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}}], "credits": [{"lang": "en", "value": "@arnoldasr (GitHub)", "type": "reporter"}, {"lang": "en", "value": "@Oblivionsage (GitHub)", "type": "reporter"}, {"lang": "en", "value": "@OSTIF-Derek (GitHub)", "type": "reporter"}, {"lang": "en", "value": "Jakub Zelenka", "type": "remediation developer"}, {"lang": "en", "value": "Weilin Du", "type": "remediation reviewer"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"references": [{"url": "https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-25T20:41:05.626504Z", "id": "CVE-2026-6103", "options": [{"Exploitation": "poc"}, {"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": "2026-09-25T20:41:27.115Z"}}]}}

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