CVE-2026-6103
Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection
- State
- Published
- Severity
- 4.3 Medium
- Published
- Sep 25, 2026
- Updated
- Sep 25, 2026
- Reserved
- Apr 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.3 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N | php |
Weaknesses
- CWE-190 Integer overflow or wraparound
Affected Products
| Product | Versions |
|---|---|
PHPPHP Group |
|
References
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