{"id":"CVE-2026-6103","published":"2026-09-25T21:17:23.790","lastModified":"2026-09-29T21:27:41.130","description":"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.","cvssScore":4.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","cwes":["CWE-190"],"vendors":[],"products":[],"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","tags":[]},{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","tags":[]}],"exploitRefs":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","tags":[]},{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","tags":[]}],"hasPoc":true,"ai":null}