CVE-2026-6103
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.
- Published Sep 25, 2026
- CVSS 4.3 medium
- 0.2% chance of exploitation in the next 30 days (EPSS)
Affected software
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