{"id":"CVE-2026-6103","summary":"Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection","details":"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.","aliases":["BIT-libphp-2026-6103","BIT-php-2026-6103","BIT-php-min-2026-6103","GHSA-j3wh-g957-2m85"],"modified":"2026-10-28T02:30:28.578398787Z","published":"2026-09-25T20:08:49.333Z","related":["ALSA-2026:87080","SUSE-SU-2026:24158-1","SUSE-SU-2026:4602-1","SUSE-SU-2026:4603-1","SUSE-SU-2026:4651-1","SUSE-SU-2026:4853-1","openSUSE-SU-2026:11901-1","openSUSE-SU-2026:22045-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6103.json","unresolved_ranges":[{"extracted_events":[{"range":[{"introduced":"8.2.*"},{"fixed":"8.2.34"},{"introduced":"8.3.*"},{"fixed":"8.3.35"},{"introduced":"8.4.*"},{"fixed":"8.4.26"},{"introduced":"8.5.*"},{"fixed":"8.5.11"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}],"cna_assigner":"php","cwe_ids":["CWE-190"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6103.json"},{"type":"ADVISORY","url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6103"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/php/php-src","events":[{"introduced":"0"},{"last_affected":"4f06e773c8c7e4b8430cfcf378fcd318a57f3742"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"last_affected":"0x1FFFFFFFF"}],"source":"DESCRIPTION"}]}}],"versions":["RELEASE_0_1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6103.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}]}