ANT-2026-9R51NPJC · c-blosc2 · Heap Buffer Overflow

heap-buffer-overflow high Severity Claude high · Security research firm high · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Trail of Bits. ANT-2026-9R51NPJC: Heap buffer overflow in NDLZ8 triple-mat...

GHSA-H69G-9HX6-F3V4 Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS)

Unbounded Row Index Allocation in Worksheet Parser checkSheet OOM/Panic DoS Summary The checkSheet function in github.com/xuri/excelize/v2 uses an attacker-controlled XML attribute value directly as the length argument to makexlsxRow, row without validating it against the Excel row limit TotalRow...

CVE-2026-40863 PhpSpreadsheet: CPU Denial of Service via Unbounded Row Index in SpreadsheetML XML Reader

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0, the SpreadsheetML XML reader Reader\Xml does not validate the ss:Index row attribute against the maximum allowed row count AddressRange::MAXROW = 1,048,576. An attack...

CVE-2026-40863 PhpSpreadsheet: CPU Denial of Service via Unbounded Row Index in SpreadsheetML XML Reader

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0, the SpreadsheetML XML reader Reader\Xml does not validate the ss:Index row attribute against the maximum allowed row count AddressRange::MAXROW = 1,048,576. An attack...

PhpSpreadsheet has CPU Denial of Service via Unbounded Row Index in SpreadsheetML XML Reader

Summary The SpreadsheetML XML reader Reader\Xml does not validate the ss:Index row attribute against the maximum allowed row count AddressRange::MAXROW = 1,048,576. An attacker can craft a SpreadsheetML XML file with ss:Index="999999999" on a element, which inflates the internal cachedHighestRow ...

GHSA-84WQ-86V6-X5J6 PhpSpreadsheet has CPU Denial of Service via Unbounded Row Index in SpreadsheetML XML Reader

Summary The SpreadsheetML XML reader Reader\Xml does not validate the ss:Index row attribute against the maximum allowed row count AddressRange::MAXROW = 1,048,576. An attacker can craft a SpreadsheetML XML file with ss:Index="999999999" on a element, which inflates the internal cachedHighestRow ...