CVE-2026-6409: Php Missing Negative Size Check In Buffer Read
A buffer bounds check uses `$this->bufferSize() < $SIZE` without first guarding against negative values of `$SIZE`. If `$SIZE` is derived from untrusted wire data (e.g., a protobuf varint cast to (int)), integer overflow can produce a negative value that always passes the non-negative `bufferSize()` comparison. Subsequent use of a negative size with `substr(
PHPgreprules fetch cve-2026-6409-php-missing-negative-size-check-in-buffer-read --engine opengrepDescription
A buffer bounds check uses `$this->bufferSize() < $SIZE` without first guarding against negative values of `$SIZE`. If `$SIZE` is derived from untrusted wire data (e.g., a protobuf varint cast to (int)), integer overflow can produce a negative value that always passes the non-negative `bufferSize()` comparison. Subsequent use of a negative size with `substr(
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