CVE-2026-6103
MEDIUM
4,3
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: changed
Confidentiality: none
Integrity: low
Availability: none
Description
AI Translation Available
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.
190
Integer Overflow or Wraparound
StableCommon Consequences
Security Scopes Affected:
Availability
Integrity
Confidentiality
Access Control
Other
Potential Impacts:
Dos: Crash, Exit, Or Restart
Dos: Resource Consumption (Memory)
Dos: Instability
Modify Memory
Execute Unauthorized Code Or Commands
Bypass Protection Mechanism
Alter Execution Logic
Dos: Resource Consumption (Cpu)
Applicable Platforms
Languages:
Not Language-Specific, C
https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85
https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85