medium4.3
CVE-2026-6103
phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check.
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Php | Php | from 8.2.0 before 8.2.34 from 8.3.0 before 8.3.35 from 8.4.0 before 8.4.26 from 8.5.0 before 8.5.11 |