CVE-2026-6103 — Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection
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 …
Published: 2026-09-25 · CVSS: 4.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7