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vuln-cve/data/2026/6xxx/CVE-2026-6103.json
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{
"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"
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"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"
},
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"status": "affected",
"version": "8.3.*",
"lessThan": "8.3.35",
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"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.",
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"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"
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"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"
},
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"content": {
"timestamp": "2026-09-25T20:41:05.626504Z",
"id": "CVE-2026-6103",
"options": [
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"Exploitation": "poc"
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{
"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",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"dateUpdated": "2026-09-25T20:41:27.115Z"
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