CVE-2026-6103
Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-190 |
| Vendor | php group |
| Product | php |
| Published | Sep 25, 2026 |
| Last Updated | Sep 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
PHP Group / PHP
8.2.* < 8.2.34 8.3.* < 8.3.35 8.4.* < 8.4.26 8.5.* < 8.5.11
References
Credits
🔍 @arnoldasr (GitHub) 🔍 @Oblivionsage (GitHub) 🔍 @OSTIF-Derek (GitHub) Jakub Zelenka Weilin Du