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    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
    Last Modified:Oct 23, 2026
    EPS:Sep 25, 2026
    EPSS Score:0.00167
    CVSS Score:4.3

    Affected Products

    Vendor
    Php
    Product
    Php
    Vendor
    Php Group
    Product
    Php
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High