{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-6103","sourceIdentifier":"security@php.net","published":"2026-09-25T21:17:23.790","lastModified":"2026-10-23T14:07:18.323","vulnStatus":"Analyzed","cveTags":[],"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."}],"affected":[{"source":"security@php.net","affectedData":[{"vendor":"PHP Group","product":"PHP","defaultStatus":"unaffected","versions":[{"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","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security@php.net","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","baseScore":4.3,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.5,"impactScore":1.4},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","baseScore":3.3,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-25T20:41:05.626504Z","id":"CVE-2026-6103","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security@php.net","type":"Secondary","description":[{"lang":"en","value":"CWE-190"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.2.0","versionEndExcluding":"8.2.34","matchCriteriaId":"AAFB3643-4D71-46ED-8184-DDE5FE41CD02"},{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.3.0","versionEndExcluding":"8.3.35","matchCriteriaId":"FF664EE8-D417-45A4-84DF-158F5073FDE8"},{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.4.0","versionEndExcluding":"8.4.26","matchCriteriaId":"52D4BECA-EF0D-4180-837C-AEFA7A12D243"},{"vulnerable":true,"criteria":"cpe:2.3:a:php:php:*:*:*:*:*:*:*:*","versionStartIncluding":"8.5.0","versionEndExcluding":"8.5.11","matchCriteriaId":"308803C0-9FC8-40D2-8920-B83BCC48014F"}]}]}],"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","source":"security@php.net","tags":["Vendor Advisory","Exploit"]},{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Vendor Advisory","Exploit"]}]}}