Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection
At a glance
Severity
MEDIUM 4.3
EPSS
EPSS 0.16 % · percentile 5 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
php
NVD status
Analyzed
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.
